Download PTU (Punjab Technical University) B.Tech (Bachelor of Technology) / BE (Bachelor of Engineering) 2021 January BT-Biotechnology 3rd Sem 76948 Biochemistry Previous Question Paper
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (BT) (2018 Batch) (Sem.?3)
BIOCHEMISTRY
Subject Code : BTBT304-18
M.Code : 76948
Time : 3 Hrs. Max. Marks : 60
INST RUCT IONS T O CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
Write briefly :
1.
What are ketone bodies?
2.
Why is it essential for Glucose molecule to undergo phosphorylation to enter into
metabolism?
3.
What are the regulatory steps of Citric acid cycle?
4.
What are Cot Curves? Highlight their relevance.
5.
What is the difference between cyclic and non-cyclic phosphorylation?
6.
Where does the conversion of pyruvate to Acetyl CoA occur? Which enzyme complex
participates in this conversion?
7.
Starch is made up of amylose and Amylopectin. Highlight the differences between
amylose and amylopectin.
8.
What are gluconeogenic amino acids?
9.
What is a proteasome and how does it function?
10. Which step is known as the committed step of glycolysis and why?
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SECTION-B
11. Write short notes on (300-400 words) :
a) Ketosis
b) F0-F1 Particle.
12. Which molecule is the precursor of cholesterol? Discuss the metabolic fates of
cholesterol.
13. Phosphorylation reactions are involved in transfer of energy and mediated by kinases.
Differentiate between substrate level phosphorylation and oxidative phosphorylation
giving suitable examples.
14. Discuss briefly the role of Acetyl CoA - citrate shuttle in fatty acid biosynthesis.
15. The regulatory step in Glycolysis is the formation of Fructose 1, 2-bisphosphate. Explain
the role of enzymes PFK (phosphofructokinase) 1 and PFK2 (phosphofructokinase) in
regulating glycolysis.
SECTION-C
16. Citric Acid Cycle is an anaplerotic cycle. Draw a well labelled diagram of Citric acid
cycle giving name of all enzymes and cofactors and its connections to the amino acid
metabolism and fat metabolism.
17. What is the difference in fixation of CO2 in C3 and C4 plants? Why is it so that the
photosynthetic pigments are arranged on chloroplast membranes and not in solution in
the stroma?
18. Describe the role of Photosystem I and Photosystem II in the light reactions of
Photosynthesis.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 26 June 2021