Download JNU 2020 Life Science (Slsm) Previous Question Paper || Jawaharlal Nehru University (JNU) Last 10 Years Question Paper
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Exam Date: 05-Oct-2020
Exam Time: 15:00-18:00
Examination: 1. Course Code - M.A./M.Sc./M.C.A.
2. Field of Study - LIFE SCIENCE (SLSM)
SECTION 1 - SECTION 1
Question No.1 (Question Id - 16)
Which one of the following organisms produces aflatoxin ?
(A)
Bacillus cereus
(B)
Aspergillus flavus (Correct Answer)
(C)
Rhodospirillum rubrum
(D)
Cladosporium flavum
Question No.2 (Question Id - 9)
In Arabidopsis thaliana, a gene called LEAFY (LFY) encodes transcription factor LFY. Plants with
LFY mutation :
A. Do not make leaves beyond rosette stage.
B. They make sterile flowers.
C. They show altered phyllotaxy.
D. They show delayed flowering.
Choose the most appropriate answer from the options given below :
(A)
A and C Only
(B)
A and D Only
(C)
B and C Only
(D)
B and D Only (Correct Answer)
Question No.3 (Question Id - 67)
Which one of the following statements with respect to amphibian development is true ?
(A)
It follows meroblastic, superficial cleavage pattern.
(B)
Gastrulation begins with invagination of bottle cells followed by the coordinated
involution of mesoderm cells. (Correct Answer)
(C)
The dorsal-most vegetal (endodermal) cells mark the `organizer'.
(D)
The ventral-most vegetal (endodermal) cells mark the `organizer'.
Question No.4 (Question Id - 96)
Among the following cells, which one is the longest living in perennial trees ?
(A)
Cork cambium
(B)
Phloem parenchyma
(C)
Ray parenchyma (Correct Answer)
(D)
Xylem parenchyma
Question No.5 (Question Id - 12)
Which of the following strains of Escherichia coli can function as donors of F factor :
A. F+
B. Hfr
C. F-
D. F'
Choose the most appropriate answer from the options given below :
(A)
A, C and D Only
(B)
A, B and C Only
(C)
A, B and D Only (Correct Answer)
(D)
B, C and D Only
Question No.6 (Question Id - 48)
Given below are two statements :
Statement I:
Cell cycle checkpoints are essential only when cells are stressed or damaged.
Statement II:
Cell cycle checkpoints may also act during a normal cell cycle to ensure proper coordination of
events.
In the light of the above statements, choose the most appropriate answer from the options given
below :
(A)
Both Statement I and Statement II are correct
(B)
Both Statement I and Statement II are incorrect
(C)
Statement I is correct but Statement II is incorrect
(D)
Statement I is incorrect but Statement II is correct (Correct Answer)
Question No.7 (Question Id - 38)
The below question has been dropped and full marks are awarded.
Nucleotides consist of a purine or pyrimidine base linked to the __________.
(A)
1' carbon of a pentose sugar having a phosphate group on 5' carbon.
(B)
2' carbon of a pentose sugar having a phosphate group on 5' carbon.
(C)
5'carbon of a pentose sugar having a phosphate on either of the 5' or 3' carbon.
(D)
1' carbon of a pentose sugar having a phosphate group on the 3' carbon.
Question No.8 (Question Id - 86)
Which of the following equation is not correct ?
(A)
cos2 x + sin2x = 1
(B)
cos [/2 + x] = - sin x
(C)
cos [2 - x] = - cos x (Correct Answer)
(D)
sin [2 - x] = - sin x
Question No.9 (Question Id - 26)
Which of the following statements is incorrect :
A. Glycolysis involves conversion of a 6 carbon glucose to two molecules of 3 carbon pyruvate.
B. For each glucose molecule converted, 4 molecules of ATP is the net yield of glycolysis.
C. In eukaryotic cells, the citric acid cycle takes place in the cytosol.
D. Both NADPH and NADH are electron donors and function in interchangeable manner.
Choose the most appropriate answer from the answer given below :
(A)
B Only
(B)
C Only
(C)
B and C Only
(D)
B, C, D Only (Correct Answer)
Question No.10 (Question Id - 78)
(A)
A - I, B - III, C - IV, D - II
(B)
A - II, B - III, C - IV, D - I
(C)
A - III, B - II, C - I, D - IV (Correct Answer)
(D)
A - IV, B - III, C - II, D - I
Question No.11 (Question Id - 83)
(A)
7/3
(B)
19/3 (Correct Answer)
(C)
5
(D)
9
Question No.12 (Question Id - 43)
Which of the following statements regarding DNA as a genetic material are true :
A. DNA replication is semiconservative.
B. DNA replication is discontinuous in both strands.
C. The coding sequences or expressed sequences are called introns.
D. Eukaryotic DNA is polycistronic.
E. The DNA dependent DNA polymerase catalyses polymerization in 5'-3' direction.
Choose the most appropriate answer from the options given below :
(A)
A, B, E Only
(B)
A, B, C Only
(C)
A, B, C, D Only
(D)
A, E Only (Correct Answer)
Question No.13 (Question Id - 39)
During DNA replication, RNA primer is removed by :
(A)
3' exonuclease of DNA polymerase I
(B)
Ribonuclease H (Correct Answer)
(C)
Ribonuclease A
(D)
(epsilon) subunit of DNA Polymerase III
Question No.14 (Question Id - 87)
Find the equation of a curve passing through the point ( - 2, 3), given that the slope of the tangent to
the curve at any point (x, y) is 2x/y2.
(A)
y = [3x2 + 15]1/3 (Correct Answer)
(B)
y = [3x + 15]1/3
(C)
y = [3x2 + 15]1/2
(D)
y = [3x3 + 15]1/3
Question No.15 (Question Id - 93)
Arrange the following in the decreasing order of the amount of water absorbed or excreted in
alimentary canal.
(A)
Colon > ilium > jejunum > faeces
(B)
Jejunum > ilium > colon > faeces (Correct Answer)
(C)
Faeces > jejunum > ilium > colon
(D)
Colon > jejunum > ilium > faeces
Question No.16 (Question Id - 89)
A committee of 3 persons is to be constituted from a group of 2 men and 3 women. How many
combinations are possible for making a committee which would consist of 1 man and 2 women ?
(A)
3
(B)
4
(C)
6 (Correct Answer)
(D)
7
Question No.17 (Question Id - 95)
Insulin facilitates the entry of glucose into :
(A)
Mucosa of small intestine
(B)
Neurons in the cerebral cortex
(C)
Renal tubular cells
(D)
Skeletal muscles (Correct Answer)
Question No.18 (Question Id - 80)
Which of the following expression is the correct ?
(A)
Universal gas constant (R)=8.3145 cal.K-1.mol-1.
(B)
Boltzmann Constant (kB)=1.3807x10-23 J.K-1. (Correct Answer)
(C)
Planck's constant ()=6.6261x10-23 J.s.
(D)
Avogadro's number (N)=6.0221x1034 molecules.mol-1.
Question No.19 (Question Id - 5)
Match the descriptions given in (List - I) with the terms given in (List - II).
List - I
List - II
A. Gravity sensing amyloplast I. Statoliths
B. Gravity sensing cells
II. Starch sheath
C. Gravity sensing tissue
III. Statocytes
D. Gravity sensing organ
IV. Roots
Choose the correct answer from the options given below :
(A)
A - I, B - III, C - IV, D - II
(B)
A - I, B - III, C - II, D - IV (Correct Answer)
(C)
A - IV, B - III, C - I, D - II
(D)
A - IV, B - II, C - I, D - III
Question No.20 (Question Id - 58)
Which of the following are characteristic attributes of innate immune responses ?
A. It is the first line of defence.
B. It involves antigen-specific receptors.
C. It is non-specific.
D. It shows variable response.
E. It shows the same response every time.
Choose the most appropriate answer from the options given below :
(A)
A, B and C Only
(B)
A, C and E Only (Correct Answer)
(C)
B, C and D Only
(D)
B, D and E Only
Question No.21 (Question Id - 15)
Which of the following statements are TRUE ?
A. All bacteria have circular chromosome.
B. Bacteria can have circular or linear chromosome.
C. Bacteria can have more than one chromosome.
D. Bacterial chromosome is separated from the rest of the cytoplasm by the nuclear membrane.
Choose the most appropriate answer from the options given below :
(A)
A and B Only
(B)
A and C Only
(C)
B and C Only (Correct Answer)
(D)
B and D Only
Question No.22 (Question Id - 1)
Which plant family contributes to the highest calorific value to human diet ?
(A)
Poaceae (Correct Answer)
(B)
Agaricaceae
(C)
Brassicaceae
(D)
Fabaceae
Question No.23 (Question Id - 32)
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason
R.
Assertion A :
The partial diploid lacI+ lacO+ lacZ+ /lacI+ lacOc lacZ- constitutively produces -galactosidase.
Reason R :
Lac O is a cis-acting DNA element.
In the light of the above statements, choose the correct answer from the options given below :
(A)
Both A and R are true and R is the correct explanation of A
(B)
Both A and R are true but R is NOT the correct explanation of A
(C)
A is true but R is false
(D)
A is false but R is true (Correct Answer)
Question No.24 (Question Id - 61)
TH1 and TH2 subset differentiation are mediated by cytokines as described below :
(A)
IL12, IFN for TH1 and IL2 for TH2
(B)
IL12, IFN for TH1 and IL4 for TH2 (Correct Answer)
(C)
IL4 for TH1 and IL12 and IFN for TH2
(D)
IL4 for TH1 and IFN for TH2
Question No.25 (Question Id - 75)
What is the energy of electromagnetic wave with the wavelength of 80 m ? (where planck's constant
= 6.6 x 10-34 J.s)
(A)
6.2 x 10-23 eV
(B)
8 x 108 eV
(C)
2.4 x 10-20 eV
(D)
1.6 x 10-8 eV (Correct Answer)
Question No.26 (Question Id - 45)
A bacteriophage of genome size of 3000 bp was found to code for 5 unique polypeptides of 500, 300,
200, 150, 100 amino acids. This would suggest that the :
(A)
phage has overlapping ORFs. (Correct Answer)
(B)
phage mRNA is spliced.
(C)
phage genome has repetitive sequence.
(D)
phage proteins are phosphorylated.
Question No.27 (Question Id - 42)
Protein synthesis occurs with high fidelity. Assuming that the incorrect amino acids are inserted at
the rate of approximately 10-3. What is the probability that a polypeptide of 300 amino acids has
exactly the same as that specified by the mRNA ?
(A)
3/4 (Correct Answer)
(B)
1/3
(C)
1/2
(D)
1/5
Question No.28 (Question Id - 3)
Which of the following are micronutrients for plant ?
(A)
Chlorine and magnesium
(B)
Iron and chlorine (Correct Answer)
(C)
Iron and phosphorus
(D)
Sulphur and phosphorus
Question No.29 (Question Id - 22)
Following are certain statements regarding the synthesis of NADH and NADPH. Identify the correct
statement :
(A)
NADPH is produced in the TCA cycle and NADH is produced in the Pentose phosphate
pathway.
(B)
NADH is produced in the TCA cycle and NADPH is produced in the Pentose
phosphate pathway. (Correct Answer)
(C)
Both NADH and NADPH are produced in the TCA cycle but only NADH is produced in the
Pentose phosphate pathway.
(D)
NADH and NADPH are produced in both TCA cycle and Pentose phosphate pathway.
Question No.30 (Question Id - 2)
The deadly disease of rust in wheat is caused by :
(A)
Pleurotus ostreatus
(B)
Puccinia graminis (Correct Answer)
(C)
Giberella fuzikuroi
(D)
Claviceps purpurea
Question No.31 (Question Id - 92)
Neck vertebrae in all birds are :
A. fixed in number
B. variable in number
C. fused
D. membranous and calcified
Choose the correct answer from the options given below :
(A)
A and C Only
(B)
B and D Only
(C)
A Only
(D)
B Only (Correct Answer)
Question No.32 (Question Id - 52)
(A)
Actopheren
(B)
Arp 2/3 (Correct Answer)
(C)
Profilin
(D)
Cofilin
Question No.33 (Question Id - 63)
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason
R.
Assertion A :
DNA vaccine utilizes plasmid DNA encoding antigenic proteins that are injected directly into the
muscles of the recipient.
Reason R :
The DNA is taken up by the dendritic cells and is able to induce both cell mediated and humoral
immune response.
In the light of the above statements, choose the correct answer from the options given below :
(A)
Both A and R are true and R is the correct explanation of A (Correct Answer)
(B)
Both A and R are true but R is not the correct explanation of A
(C)
A is true but R is false
(D)
A is false but R is true
Question No.34 (Question Id - 54)
In the severe haemolytic disease of the newborn called erythroblastosis fetalis which diagnostic test
can be used to detect anti-Rh antibodies in mother's serum ?
(A)
Direct Coombs Test
(B)
Indirect Coombs Test (Correct Answer)
(C)
Rocket Immunoelectrophoresis
(D)
Western blotting
Question No.35 (Question Id - 59)
Which of the following statements about the complement fixation are true ?
A. C3 convertase in alternative pathway is C3bBb.
B. C3 convertase in classical pathway is C4b2a.
C. Both lectin pathway and alternative pathway are initiated by binding to C1q.
D. C1s has substrate C4 only.
E. C1q and C1s bind to Fc region of immune complex and induce conformation change in C1r.
Choose the most appropriate answer from the options given below :
(A)
A Only
(B)
A, B Only (Correct Answer)
(C)
A, B, C, E Only
(D)
A, B, D Only
Question No.36 (Question Id - 37)
(A)
A - II, B - I, C - III, D - IV
(B)
A - II, B - IV, C - I, D - III
(C)
A - II, B - IV, C - III, D - I
(D)
A - II, B - III, C - I, D - IV (Correct Answer)
Question No.37 (Question Id - 91)
Which of the following is the principal buffer in interstitial fluid ?
(A)
Carbonic acid (Correct Answer)
(B)
Haemoglobin
(C)
Other proteins
(D)
H2PO4
Question No.38 (Question Id - 90)
Identify the correct statement regarding haemoglobin.
(A)
CO2 and CO bind to the same site on haemoglobin.
(B)
CO2 and O2 bind to the same site on haemoglobin.
(C)
O2 and CO bind to the same site on haemoglobin. (Correct Answer)
(D)
O2 and CO bind to different sites on haemoglobin.
Question No.39 (Question Id - 6)
Match the type of water movement (List - I) with their corresponding mode of transport (List - II) :
List - I
List - II
A. Apoplastic
I. From protoplast to protoplast via plasmodesmata
movement
B. Symplastic
II. Via cell walls
movement
C. Transcellular
III. Via hydathodes
movement
D. Guttation movement IV. From cell to cell with water passing through plasma membrane and
tonoplasts
Choose the correct answer from the options given below :
(A)
A - III, B - II, C - I, D - IV
(B)
A - I, B - II, C - III, D - IV
(C)
A - II, B - I, C - IV, D - III (Correct Answer)
(D)
A - IV, B - III, C - II, D - I
Question No.40 (Question Id - 85)
(A)
tan x - sec x + C (Correct Answer)
(B)
sec x - tan x + C
(C)
sin x - cos x + C
(D)
cos x - sin x + C
Question No.41 (Question Id - 25)
It appears that a signalling protein has a serine residue at position 96 that is phosphorylated upon the
activation of the signal. To confirm this, you plan to replace it by another amino acid so that it loses
its function (loss of function mutation). Which of the following amino acid would be of your choice for
its replacement ?
(A)
Threonine
(B)
Alanine (Correct Answer)
(C)
Glycine
(D)
Aspartic acid
Question No.42 (Question Id - 62)
Antigen pulsed peritoneal macrophages were taken from mouse strain H2b and antigen primed T
cells from mouse strain H2k were added in the same well. T cell proliferation was assessed.
(A)
T cell proliferation will not occur. (Correct Answer)
(B)
T cell proliferation will occur.
(C)
T cell proliferation will occur only if there is stimulation along with adjuvants.
(D)
Cannot assess with the given information since type of antigen is not specified.
Question No.43 (Question Id - 76)
A radio transmitter operates at a frequency of 500 kHz with a power of 8 kw. How many photons are
emitted per second (given Planck's constant = 6.6 x 10-34 J.S) ?
(A)
8 x 1016
(B)
3 x 1021
(C)
2.4 x 1032 (Correct Answer)
(D)
6.6 x 1034
Question No.44 (Question Id - 14)
Match the organisms (List - I) with the corresponding diseases they cause (List - II).
List - I
List - II
A. Escherichia coli
I. Urinary tract infection
B. Streptococcus pyogenes II. Sore throat
C. Shigella flexneri
III. Gas gangrene
D. Clostridium perfringens
IV. Bacillary dysentry
Choose the correct answer from the options given below :
(A)
A - I, B - III, C - II, D - IV
(B)
A - IV, B - II, C - III, D - I
(C)
A - I, B - II, C - IV, D - III (Correct Answer)
(D)
A - I, B - II, C - III, D - IV
Question No.45 (Question Id - 88)
Which of the following is correct for the following differential equation
xy[d2y/dx2] + x[dy/dx]2 - y[dy/dx] = 0.
(A)
The highest order derivative present in the differential equation is dy/dx, so its order is one.
(B)
The highest order derivative present in the differential equation is d2y/dx2, so its order
is two. (Correct Answer)
(C)
The highest order derivative present in the differential equation is dy/dx2, so its order is one.
(D)
The highest order derivative present in the differential equation is dy2/dx2, so its order is one.
Question No.46 (Question Id - 30)
In cats curled ears result from allele Cu+ which is dominant over cu (normal ears). The allele B (black
body) is dominant over b (gray body). A gray cat homozygous for curled ears was mated with a black
cat homozygous for normal ears. The F1 progeny all had black body and curled ears. One of the F1
progeny was mated with a cat homozygous both for black body and normal ears. Which of the
following statements is TRUE regarding the progeny of this cross ?
A. The ratio of curled ears to normal ears will be 3 : 1
B. The ratio of black body to gray body will be 1 : 1
C. The ratio of curled ears to normal ears will be 1 : 1
D. The ratio of black body to gray body will be 3 : 1
Choose the most appropriate answer from the options given below :
(A)
A and B Only
(B)
B and C Only (Correct Answer)
(C)
C and D Only
(D)
A and D Only
Question No.47 (Question Id - 72)
(A)
A - II, B - III, C - IV, D - I
(B)
A - II, B - III, C - I, D - IV
(C)
A - IV, B - I, C - II, D - III (Correct Answer)
(D)
A - III, B - I, C - IV, D - II
Question No.48 (Question Id - 36)
Which one of the following sentences is not related to the beta diversity ?
A. Beta diversity is high when there are differences in the number of species along the geographical
or environmental gradient.
B. Beta diversity is low when same number of species is found across the environmental gradient.
C. Genetic diversity within a species is used to measure the beta diversity.
D. Beta diversity measures the number of species in a large region.
Choose the most appropriate answer from the options given below :
(A)
A Only
(B)
B Only
(C)
C and D Only (Correct Answer)
(D)
B and D Only
Question No.49 (Question Id - 65)
(A)
A - I, B - IV, C - III, D - II
(B)
A - I, B - II, C - III, D - IV
(C)
A - II, B - I, C - IV, D - III
(D)
A - IV, B - II, C - I, D - III (Correct Answer)
Question No.50 (Question Id - 84)
In a population, 240 individuals had been exposed to the pesticide A1, 100 individuals had been
exposed to the pesticide A2 and 60 individuals had been exposed to both the pesticides A1 and A2.
Which of the following statement is correct ?
(A)
The number of individuals exposed to pesticide A1 but not to pesticide A2 is 90.
(B)
The number of individuals exposed to pesticide A2 but not to pesticide A1 is 90.
(C)
The number of individuals exposed to pesticide A1 but not to pesticide A2 is 180.
(Correct Answer)
(D)
The number of individuals exposed to pesticide A2 but not to pesticide A1 is 180.
Question No.51 (Question Id - 40)
Which is the correct order of the following organisms in terms of increasing genome size ?
A. Sacchromyces cerevisiae
B. Arabdopsis thaliana
C. Haemophilus influenza
D. Mycoplasma genitalium
Choose the correct answer from the options given below :
(A)
A, B, C, D
(B)
B, C, D, A
(C)
D, C, A, B (Correct Answer)
(D)
C, D, A, B
Question No.52 (Question Id - 49)
Rohit extracted DNA from epithelial cells and found the presence of 27% cytosine. He calculated the
percentage composition of rest of the bases. Choose the correct answer.
(A)
A = 73; C = 27; T = 27; G = 73
(B)
A = 73; C = 27; T = 73; G = 27
(C)
A = 27; C = 27; T = 73; G = 73
(D)
A = 23; C = 27; T = 23 ; G = 27 (Correct Answer)
Question No.53 (Question Id - 81)
Mean free path of gas molecule is defined as, (where N/V = molecules/volume, d = molecular
diameter,
= mean free path).
(A)
=1/2 d2 N/V (Correct Answer)
(B)
=1/2 d2 N/V
(C)
=1/2 d N/V
(D)
=1/2 d2 NV
Question No.54 (Question Id - 20)
During gluconeogenesis, one of the following conversions is catalysed by an enzyme that is different
from the enzyme that does reverse conversion during glycolysis. Identify it.
(A)
Conversion of Dihydroxyacetone phosphate to Glyceraldehyde-3-phosphate
(B)
Conversion of 3-phosphoglycerate to 2-phosphoglycerate
(C)
Conversion of 2-phosphoglycerate to phosphoenolpyruvate
(D)
Conversion of Fructose-1, 6-bisphate to Fructose-6-phosphate (Correct Answer)
Question No.55 (Question Id - 46)
In a new species methylated Guanosine is recognized as a distinct nucleotide by the translation
system apart from the 4 normal nucleosides. How many unique triplet codons are possible ?
(A)
64
(B)
125 (Correct Answer)
(C)
128
(D)
256
Question No.56 (Question Id - 27)
Which of the following statements about Chargaff's rule is FALSE ?
A. Largely, the ratio of Purine to pyrimidine is 1 : 1
B. Adenine + Guanine = Thymine + Cytosine
C. Adenine + Thymine = Guanine + Cytosine
D. Adenine + Guanine + Thymine + Cytosine = 1
Choose the most appropriate answer from the options given below :
(A)
A and D Only
(B)
B and C Only
(C)
C and D Only (Correct Answer)
(D)
B and D Only
Question No.57 (Question Id - 19)
Matching the plant disease (List - I) with the respective causative agents (List - II).
List - I
List - II
A. Red rot of sugarcane
I. Bacteria
B. Brown rot of potato
II. Fungi
C. Spotted wilt of tomato III. Phytoplasma
D. Little leaf of brinjal
IV. Virus
Choose the most appropriate answer from the options given below :
(A)
A - I, B - II, C - III, D - IV
(B)
A - II, B - I, C - III, D - IV
(C)
A - I, B - II, C - IV, D - III
(D)
A - II, B - I, C - IV, D - III (Correct Answer)
Question No.58 (Question Id - 68)
Which one of the following combination of statements regarding the extra embryonic membrane is
correct ?
A. Amnion is the water sac that protects the embryo.
B. Chorion stores urinary waste and help mediate gas exchange.
C. Chorion is the water sac that protects the embryo.
D. Yolk sac is derived from splanchopleure that grows over the yolk to enclose it and helps mediate
nutrition.
Choose the most appropriate answer from the options given below :
(A)
A and B only
(B)
B and C only
(C)
C and D only
(D)
A and D only (Correct Answer)
Question No.59 (Question Id - 100)
What is the pH and pOH of 0.001 M solution of HCl ?
(A)
3, 11 (Correct Answer)
(B)
3, 10
(C)
2, 12
(D)
11, 3
Question No.60 (Question Id - 41)
What anticodon sequence would pair with the codon 5'-AUG-3' assuming only Watson-Crick base
pairing ?
(A)
3'-UAC-5' (Correct Answer)
(B)
3'-CAU-5'
(C)
5'-CAU-3'
(D)
5'-UAC-3'
Question No.61 (Question Id - 77)
An electric field is applied to a semiconductor. There are N number of charge carriers with the
average drift speed v. Which of the following option is true if the temperature is increased ?
(A)
Both N and v will decrease.
(B)
Both N and v will increase.
(C)
N will decrease but v will increase.
(D)
N will increase but v will decrease. (Correct Answer)
Question No.62 (Question Id - 53)
(A)
A - I, B - III, C - II
(B)
A - III, B - II, C - I
(C)
A - III, B - I, C - II (Correct Answer)
(D)
A - II, B - I, C - III
Question No.63 (Question Id - 99)
Genomic DNA of bacteriophage T4 is double stranded. If viral genome is heated and cooled, both
linear and circular molecules are obtained. This is primarily due to the fact that :
(A)
all linear DNA on heating and cooling take circular shape.
(B)
the DNA molecule is circularly permuted.
(C)
the DNA molecule has cohesive terminal ends. (Correct Answer)
(D)
while passing through the hosts, the DNA molecule got integrated into the host genome to
become circular.
Question No.64 (Question Id - 55)
Which of the following five major classes of antibodies can activate classical complement pathway ?
A. IgA
B. IgD
C. IgE
D. IgG
E. Igm
Choose the most appropriate answer from the options given below :
(A)
A and E Only
(B)
B and E Only
(C)
D and E Only (Correct Answer)
(D)
B and C Only
Question No.65 (Question Id - 31)
If the father has the genotype IBi and the mother has the genotype IAIB, then what proportion of
progeny will have O blood group ?
(A)
0% (Correct Answer)
(B)
25%
(C)
50%
(D)
75%
Question No.66 (Question Id - 70)
Which one of the following compounds does not contain triple bond ?
(A)
Acetonitrile
(B)
Nitrogen
(C)
Carbon-monoxide
(D)
Ozone (Correct Answer)
Question No.67 (Question Id - 33)
In tomato plants, red fruit (R) is dominant to yellow (r) and tallness (T) is dominant to short (t). What
phenotypic and genotypic ratio would result if one of the parent plants is red homozygous and tall
homozygous and other is red heterozygous and tall heterozygous ?
(A)
Phenotypically all are red and tall. Genotypically all are homozygous for both characters.
(B)
Half the plants obtained are red and tall and half are yellow and short.
(C)
Phenotypically all are red and tall but genotypically four different types of plants exist.
(Correct Answer)
(D)
Half the plants are phenotypically red and tall and half are yellow and short and genotypically
two types of plants exist.
Question No.68 (Question Id - 18)
Which one of the following organisms can be used as "natural genetic engineer" for transformation of
japonica varieties of rice ?
(A)
Agrobacterium japonicum
(B)
Agrobacterium tumefaciens (Correct Answer)
(C)
Bradyrhizobium japonicum
(D)
Pseudomonas japonicum
Question No.69 (Question Id - 23)
During metabolic conversion, transfer of C1 units is mediated by all of the following, except :
(A)
N5-Methyl-Tetrahydrofolate
(B)
N5-formyl-Tetrahydrofolate
(C)
S-adenosyl methionine
(D)
7, 8 Dihydrofolate (Correct Answer)
Question No.70 (Question Id - 50)
A diploid eukaryotic cell, possessing 3.2 x 106 bp, will have how many nucleosomes ?
(A)
1.2 x 104 nucleosomes
(B)
1.6 x 104 nucleosomes (Correct Answer)
(C)
0.8 x 104 nucleosomes
(D)
0.6 x 104 nucleosomes
Question No.71 (Question Id - 79)
The diffusion current in a P-N junction is :
(A)
from the N-side to the P-side.
(B)
from the P-side to the N-side. (Correct Answer)
(C)
from the N-side to the P-side, if the junction is forward and opposite direction if it is reverse
biased.
(D)
from the P-side to the N-side if the junction is forward and opposite direction if it is reverse
biased.
Question No.72 (Question Id - 66)
Given below are two statements :
Statement I:
Sea-urchin eggs are isolecithal.
Statement II:
Insect eggs are telolecithal.
In the light of the above statements, choose the most appropriate answer from the options given
below :
(A)
Both Statement I and Statement II are correct
(B)
Both Statement I and Statement II are incorrect
(C)
Statement I is correct but Statement II is incorrect (Correct Answer)
(D)
Statement I is incorrect but Statement II is correct
Question No.73 (Question Id - 82)
Bragg's law states the relationship between incident direction of the wave from diffraction plane and
wavelength of the radiation. (where d = inter planar spacing; n = 1, 2, 3, 4..., = incidence angle).
Which of the following equation is correct ?
(A)
2dsin = n (Correct Answer)
(B)
dsin = n
(C)
2dsin = (n + 1/2)
(D)
2dsin = (n + 1)
Question No.74 (Question Id - 21)
The sedimentation coefficient of E coli ribosome is 70S, where "S" stands for :
(A)
Sutherland
(B)
Svedberg (Correct Answer)
(C)
Stahl
(D)
Stein
Question No.75 (Question Id - 69)
(A)
(A) < (B) < (C) < (D)
(B)
(A) < (B) < (D) < (C)
(C)
(B) < (A) < (C) < (D) (Correct Answer)
(D)
(B) < (A) < (D) < (C)
Question No.76 (Question Id - 56)
Small molecule haptens can be made immunogenic by :
(A)
giving multiple intravenous injections.
(B)
using in a large amount.
(C)
using Freund's complete adjuvant.
(D)
conjugating the hapten with a large molecular weight protein. (Correct Answer)
Question No.77 (Question Id - 97)
Which of the following herbivores, when crowded and starved, become cannibalistic ?
This change in diet accompanied by the rapid conversion of the midgut from long winding canal into a
much shorter passageway.
(A)
Frog
(B)
Salamander larva (Correct Answer)
(C)
Cockroach
(D)
Earthworm
Question No.78 (Question Id - 94)
Which of the following function is not performed by the microtubules in the cells ?
A. Cell movement
B. Chromosomal movement
C. Separate the dividing cell into two
D. Organelles transport
Choose the correct answer from the options given below :
(A)
A and C Only
(B)
B and D Only
(C)
C and D Only
(D)
C Only (Correct Answer)
Question No.79 (Question Id - 13)
Which of the following statements, is NOT TRUE about the resolution of a light microscope ?
(A)
Blue light has more resolving power than red light.
(B)
Higher the numerical aperture of the objective lens, better is the resolution.
(C)
Numerical aperture of the condenser also affects the resolution.
(D)
Lens working in the air can have numerical aperture greater than 1.0. (Correct Answer)
Question No.80 (Question Id - 4)
Following are the two sets of experiments for studying the effect of light treatment on seed
germination. Water-soaked seeds were treated with specific lights, sequentially as mentioned below.
Set 1 : Red light Far-red light Red light
Set 2 : Far-red light Red light Red light
Which of the following is likely to be observed ?
(A)
Set 1 will germinate faster than Set 2.
(B)
Set 2 will germinate faster than Set 1.
(C)
Both sets will germinate equally. (Correct Answer)
(D)
None of the sets will germinate.
Question No.81 (Question Id - 44)
Oxidation of fatty acids in mitochondria generates ______________ as end-product.
(A)
Acyl-CoA
(B)
glycerol
(C)
Acetyl-CoA (Correct Answer)
(D)
triglyceride
Question No.82 (Question Id - 74)
For the conversion of reactant X to product Y, the change in enthalpy is 8 kJ.mol-1 and the change in
entropy is 20 J.K-1mol.-1 Above what temperature does the reaction become spontaneous ?
(A)
45C
(B)
60C
(C)
77C
(D)
127C (Correct Answer)
Question No.83 (Question Id - 57)
During inflammation, when white blood cells from blood stream travel into surrounding tissues,
leukocyte extravasation is the central feature of cell trafficking and it involves the following events :
A. Activation by chemokines
B. Transendothelial migration or diapedesis
C. Tethering and rolling mediated by selectins
D. Arrest and adhesion mediated by integrins
Arrange them in the correct sequential order :
(A)
A, B, C, D
(B)
D, C, B, A
(C)
C, D, B, A
(D)
C, A, D, B (Correct Answer)
Question No.84 (Question Id - 24)
Haemoglobin binds to oxygen molecule via its :
(A)
One of the nitrogen atom in the porphyrin ring
(B)
Tyrosine residue the 8th helix
(C)
Proximal histidine residue in the 8th helix
(D)
Fe++ ion in the porphyrin ring (Correct Answer)
Question No.85 (Question Id - 64)
(A)
A - II, B - I, C - IV, D - III
(B)
A - II, B - III, C - IV, D - I
(C)
A - IV, B - I, C - II, D - III (Correct Answer)
(D)
A - IV, B - III, C - II, D - I
Question No.86 (Question Id - 98)
Who among the following scientists have received the Nobel Prize in Physiology and Medicine in
2019 ?
(A)
J.P. Allison and T. Honjo
(B)
W.G. Kaelin, P.J. Ratcliffe and G.L. Semenza (Correct Answer)
(C)
M.W. Young, M. Rosbash and J.C. Hall
(D)
Y. Ohsumi
Question No.87 (Question Id - 29)
Given below are two statements :
Statement I:
RFLP is used in DNA fingerprinting.
Statement II:
RFLP is a co-dominant marker.
In the light of the above statements, choose the most appropriate answer from the options given
below :
(A)
Both Statement I and Statement II are correct. (Correct Answer)
(B)
Both Statement I and Statement II are incorrect.
(C)
Statement I is correct but Statement II is incorrect.
(D)
Statement I is incorrect but Statement II is correct.
Question No.88 (Question Id - 73)
0.1 M solution of an weak acid has pH equal to 5 at 298 K. What is the dissociation constant of that
acid ?
(A)
10-9 (Correct Answer)
(B)
10-11
(C)
10-7
(D)
10-5
Question No.89 (Question Id - 47)
In a PCR experiment 1 ng of a 100 bp PCR template was amplified using specific primers. Assuming
100% efficiency of the PCR reaction the amount of 100 bp fragment after 10 cycle of PCR reaction is
about :
(A)
10 ng
(B)
100 ng
(C)
1000 ng (Correct Answer)
(D)
10000 ng
Question No.90 (Question Id - 28)
(A)
A - I, B - II, C - III
(B)
A - II, B - I, C - III
(C)
A - II, B - III, C - I (Correct Answer)
(D)
A - III, B - II, C - I
Question No.91 (Question Id - 17)
Those parasites capable of switching to saprophytic mode of nutrition are known as :
(A)
Facultative saprophytes (Correct Answer)
(B)
Facultative parasites
(C)
Obligate parasites
(D)
Obligate saprophytes
Question No.92 (Question Id - 60)
In monoclonal antibody production, the role of aminopterin in the HAT medium is to :
(A)
block the salvage pathway of DNA synthesis.
(B)
cause fusion of plasma cell and myeloma cell.
(C)
block the de novo pathway of DNA synthesis. (Correct Answer)
(D)
prevent myeloma-myeloma fusion.
Question No.93 (Question Id - 71)
Which one of the following molecules is an exception to the octet rule ?
(A)
Ammonia (NH3)
(B)
Boron trifluoride (BF3) (Correct Answer)
(C)
Carbon-di-oxide (CO2)
(D)
Water (H2O)
Question No.94 (Question Id - 51)
Which one of the following cytoskeletal filaments is less dynamic in nature ?
(A)
Actin
(B)
Tubulin
(C)
Intermediate filaments (Correct Answer)
(D)
Microtubules
Question No.95 (Question Id - 10)
Root endodermis plays a crucial role in maintaining water balance in plants, for the following reason/s
:
A. At the endodermis, casparian strip blocks apoplast pathway.
B. Casparian strip is composed of suberin.
C. Casparian strip maintains continuity of the apoplast pathway.
Choose the most appropriate answer from the options given below :
(A)
A Only
(B)
A and B Only (Correct Answer)
(C)
C Only
(D)
B and C Only
Question No.96 (Question Id - 7)
Given below are two statements :
Statement I:
Etiolated seedlings of corn show absence of greening, reduction in leaf width, failure of leaves to
unroll and elongation of coleoptile and mesocotyl.
Statement II:
Etiolated seedlings of mustard show absence of greening, reduced leaf size, hypocotyl elongation
and maintenance of apical hook.
In the light of the above statements, choose the most appropriate answer from the options given
below :
(A)
Both Statement I and Statement II are correct. (Correct Answer)
(B)
Both Statement I and Statement II are incorrect.
(C)
Statement I is correct but Statement II is incorrect.
(D)
Statement I is incorrect but Statement II is correct.
Question No.97 (Question Id - 11)
Which of the following statements describing the bacterial electron transport chain (ETC) are TRUE ?
A. It operates in the plasma membrane.
B. It generates a protein gradient.
C. It utilizes nitrate as the terminal electron acceptor in aerobic conditions.
D. It utilizes oxygen as the terminal electron acceptor in aerobic conditions.
Choose the most appropriate answer from the options given below :
(A)
A, B and D Only (Correct Answer)
(B)
A, C and D Only
(C)
B, C and D Only
(D)
B, A and C Only
Question No.98 (Question Id - 34)
(A)
A - IV, B - I, C - II, D - III
(B)
A - II, B - III, C - IV, D - I
(C)
A - IV, B - III, C - I, D - II (Correct Answer)
(D)
A - III, B - IV, C - II, D - I
Question No.99 (Question Id - 35)
(A)
A - III, B - II, C - I, D - IV
(B)
A - IV, B - III, C - II, D - I (Correct Answer)
(C)
A - I, B - IV, C - II, D - III
(D)
A - I, B - IV, C - III, D - II
Question No.100 (Question Id - 8)
Below are the metabolites that are formed in the TCA cycle.
A. 2-oxogluterate
B. Succinyl CoA
C. Succinate
D. Fumerate
E. Malate
Choose the correct answer that indicates order of their formation in the TCA cycle.
(A)
A C B D E
(B)
B C A D E
(C)
A B C D E (Correct Answer)
(D)
C B A E D
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This post was last modified on 21 January 2021