Download NTRUHS 1st Year MBBS 2023 December Biochemistry Paper I Question Paper

Dr YSR UNIVERSITY OF HEALTH SCIENCES: VIJAYAWADA- 520008

MBBS DEGREE EXAMINATION - DECEMBER, 2023

FIRST M.B.B.S. EXAMINATION

BIOCHEMISTRY- PAPER-I (SET-B)

(Multiple Choice Questions)

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Max Marks: 20

Time: 20 Minutes

Note: Answer all questions.

SECTION-I (MCQs - 20 MARKS) 1X2=20

1. The following amino acid can enter the citric acid cycle as oxaloacetate:
   1. Lysine

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   2. Proline
   3. Aspartate (Correct answer marked)
   4. Serine
2. Oxidative phosphorylation and electron transport chain are inhibited by the following compounds, except.
   1. Carbon monoxide

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   2. Hydrogen cyanide
   3. Oligomycin
   4. Pyrophosphate
3. The coenzyme:
   1. Increases the affinity of apoenzyme to substrate

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   2. Lowers the activation energy
   3. Accepts one of the products of the reaction
   4. Increases the number of active sites of the enzyme
4. Enzymes bind to substrate:
   1. By covalent bonds

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   2. By glycosidic bond
   3. At catalytic site only
   4. Peptide bond
5. A vitamin not available from plant source:
   1. Vitamin B1

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   2. Vitamin B12
   3. Vitamin B2
   4. Vitamin K
6. Mac Ardle's syndrome is due to deficiency of:
   1. Pyruvate kinase

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   2. Glycogen synthase
   3. Muscle glycogen phosphorylase
   4. Debranching enzyme
7. Which of the following enzyme is inhibited in starvation?
   1. Alanine transferase

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   2. Glucokinase
   3. Pyruvate carboxylase
   4. Carbonic anhydrase
8. Which of the following enzyme catalyzes substrate-level phosphorylation?
   1. Hexokinase

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   2. Phosphofructokinase
   3. Glycogen phosphorylase
   4. Pyruvate kinase
9. The serum lipoprotein with the highest cholesterol content is:
   1. High-density lipoprotein

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   2. Low-density lipoprotein
   3. Very low-density lipoprotein
   4. Chylomicron
10. Which of the following is not included in calculating the calorie requirement of an individual?
    1. BMR

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    2. RQ
    3. SDA
    4. Nature of work
11. Lysine is deficient in:
    1. Cereals (rice and wheat)

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    2. Maize and corn
    3. Pulses (Bengal gram dal)
    4. Tapioca (Cassava)
12. The structure of vitamin A contains:
    1. Naphthoquinone ring

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    2. Chromane ring
    3. Beta-ionone ring
    4. Thiazole ring
13. The following enzyme of heme biosynthesis is inhibited by lead:
    1. ALA dehydratase

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    2. UBG I Synthase
    3. ALA synthase
    4. Coproporphyrinogen oxidase
14. Which of the following processes makes use of free radicals?
    1. Cell adhesion

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    2. Phagocytosis
    3. Contact inhibition
    4. Pinocytosis
15. Hypercholesterolemia is seen in the following conditions except:
    1. Diabetes mellitus

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    2. Hyperthyroidism
    3. Nephrotic syndrome
    4. Obstructive jaundice
16. The chain elongation of fatty acid takes place in:
    1. Mitochondria

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    2. Microsomes
    3. Golgi complex.
    4. Peroxisome
17. The following are the features of starvation except:
    1. Ketoacidosis

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    2. Glycogenolysis
    3. Increase in BMR
    4. Gluconeogenesis
18. Specific gravity of urine is increased in:
    1. Chronic glomerulonephritis

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    2. Diabetes mellitus
    3. Liver disease
    4. Intake of vegetables
19. Beta oxidation of fatty acid forms all the following except:
    1. NADH

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    2. Acetyl CoA
    3. Malonyl CoA
    4. FADH2
20. Congenital erythropoietic porphyria is caused due to deficiency of:
    1. Coproporphyrinogen oxidase

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    2. Uroporphyrinogen III cosynthase
    3. PBG deaminase
    4. Protoporphyrinogen oxidase

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