BIOCHEMISTRY Question Papers (SUPPLE,2007)

SET-1

1. Explain the structure and role of some polysaccharides.
2. (a) Explain the role of fructose 2,6- bisphosphate in regulation of Glycolysis and Gluconeogenesis

(b) Explain the regulation of fructose 2,6- bisphosphate

3. Differentiate between aerobic and anaerobic hydrogen transfer and compare the energy balance of the two processes.
4. Discuss the proper balance between the activities of the producers and consumers in the biosphere.
5. List out the aminoacids that are synthesized using the precursor alpha-ketoglutarate and sketch their biosynthesis.
6. What are the major constituents of biomembranes? Sketch the salient features of lipid bilayers.
7. Enumerate the different stages involved in the extraction of energy from foodstuffs. Outline the major pathways involved in this process.
8. (a) Illustrate the electron flow during photosynthesis in higher plants.

(b) Define the terms cyclic and non-cyclic phosphorylation.

SET-2

1. Write short notes on:

(a) Structure of cellulose

(b) Structure of starch

(c) Structure of chitin

(d) Structure of amylopectin

2. Write short notes on:

(a) Futile cycle in carbohydrate metabolism

(b) Explain two alternative fates for pyruvate.

3. What is photophosphorylation? Describe the sequence of events in the phosphorylation.

4. Summarize the proper balance between the activities of the autotrophs and heterotrophs in our biosphere.

5. Explain the nitrogen cycle. What are the different phases involved in it? List out the enzymes catalyzing the individual reactions.

6. (a) What are structural lipids? Give their structural characteristics.

(b) Which are the phospholipids that have ether-linked fattyacids. Give their structures and mention their physiological significance.

7. “Free energy is the most useful thermodynamic function in Biochemistry”- Illustrate your answer with suitable metabolic pathway.

8. Discuss the Calvin cycle in detail and add a note on the regulation of the Calvin cycle.

SET-3

1. Write short notes:

(a) Homopolysaccharides

(b) Heteropolysaccharides

(c) Formation of maltose

(d) Some common disaccharides

2. (a) Explain the role of fructose 2,6- bisphosphate in regulation of Glycolysis and Gluconeogenesis

(b) Explain the regulation of fructose 2,6- bisphosphate

3. Summarize the interlocking regulation of Glycolysis, pyruvate oxidation, the citric acid cycle and oxidative phosphorylation by the relative concentrations of ATP.
4. Discuss the cycling of Nitrogen in the biosphere.
5. List out the three essential aminoacids that are synthesized from the non-essential aminoacid, aspartate. Write down their structures and sketch the biosynthesis of any two of them.
6. What are the major constituents of biomembranes? Sketch the salient features of the lipid bilayers.
7. What is citric acid cycle? How is this cycle constitutes the terminal oxidation of any foodstuff material. What is the physiological significance and energy yield in this cycle?
8. (a) Compare the basic structural features of chloroplasts and mitochondria.

(b) How does photosynthesis in green and purple bacteria differ?

SET-4

1. Write short notes:

(a) Homopolysaccharides

(b) Heteropolysaccharides

(c) Formation of maltose

(d) Some common disaccharides

2. How the glucose level of blood is maintained in animals? Discuss the role of hormones in sugar regulation in the animal body.
3. Summarize the interlocking regulation of glycolysis, pyruvate oxidation, the citric acid cycle and oxidative phosphorylation by the relative concentrations of ATP.
4. Discuss the proper balance between the activities of the producers and consumers in our biosphere.
5. List out the non- essential aminoacids indicating their structures. Sketch the biosynthesis of any three of them.
6. How a molecule of palmitic acid is completely oxidized in a mitochondrion. Enumerate the enzyme-catalyzed reactions and calculate the energy yield?
7. How do cells extract energy and reducing power from their environment?
8. (a) Compare the basic structural features of chloroplasts and mitochondria.

(b) How does photosynthesis in green and purple bacteria differ?