BIOCHEMISTRY Question Papers (Regular, 2007 Nov, R05)

SET :1
1. Write Short notes:
(a) Gangliosides
(b) Lipopolysaccharides. [8+8]

2. How the glucose level of blood is maintained in animals? Discuss the role of Hormones in sugar regulation in the animal body. [16]

3. Write short Notes:
(a) Ubiquinone
(b) Prosthetic groups of cytochrome. [16]

4. Describe proteins conformation is stabilized largely by weak interaction. [16]

5. Discuss the nitrogen cycle indicating the involvement of different enzymes in it. Explain the role of nitrogen cycle in maintaining the pool of biologically available nitrogen. [16]

6. What are ketone bodies? Give their structures and indicate their site of formation. Sketch their biosynthesis. [16]

7. What is citric acid cycle? How this cycle constitutes the terminal oxidation of any food stuff material. What is the physiological significance and energy yield in this cycle? [16]

8. (a) Illustrate the electron flow during photosynthesis in higher plants.
(b) Define the terms cyclic and non-cyclic photophosphorylation. [8+8]


SET :2

1. What do you mean by complex carbohydrates? Explain with examples. [16]

2. How the glucose level of blood is maintained in animals? Discuss the role of Hormones in sugar regulation in the animal body. [16]

3. What is proton-motive force? Write a note on the Energy of Electron Transfer is Efficiently conserved in a proton Gradient. [16]

4. What are peptides? Give an account of the formation of polypeptides in cells.[16]

5. Which are the amino acids derived from 3-phosphoglycerate. Enumerate the biosynthetic pathways of these amino acids. [16]

6. (a) Define the term lipid. How are they extracted form a natural source? What are their general characteristic features?
(b) What are storage lipids? What is their composition? Sketch their physiological
functions. [8+8]

7. How do cells extract energy and reducing power from their environment? [16]

8. (a) Illustrate the electron flow during photosynthesis in higher plants.
(b) Define the terms cyclic and non-cyclic photophosphorylation. [8+8]


SET :3

1. What do you mean by Glycoprotein’s? Explain Glycoprotein’s are information-rich Conjugates containing oligosaccharides. [16]

2. Summarize the events of oxidative decarboxylation pyruvate to acetyl-CoA by the
pyruvatedehydrogenase complex. [16]

3. What do you understand by ”redox” reactin? Write a note on oxidation versus reduction in the biological system. [16]

4. Describe proteins conformation is stabilized largely by weak interaction. [16]

5. (a) How non-oxidative deamination reactions occur in vivo? Illustrate with two examples indicating the role of coenzyme involvement.
(b) How is proline biosynthesized from glutamate? [8+8]

6. What are the common features of biological membranes? What are the major class of membrane lipids? [16]

7. Enumerate the different stages involved in the extraction of energy from food stuffs. Outline the major pathways involved in this process. [16]

8. How do the biological systems get their free energy? What is the physiological significance of photosynthesis? How the basic equation of photosynthesis was discovered? [16]


SET :4

1. Write short Notes:
(a) Glycoprotein’s
(b) Dextran
(c) Cellulose
(d) Lectins. [4+4+4+4]

2. Discuss pentose phosphate path way. [16]

3. How is a concentration gradient of proton transformed into ATP? [16]

4. (a) Discuss in detail Enzyme-catalyzed transamination.
(b) What is the role of pyridoxal phosphate in the conversion of α-amino groups to α-Ketoglutaride. [16]

5. Discuss the nitrogen cycle indicating the involvement of different enzymes in it. Explain the role of nitrogen cycle in maintaining the pool of biologically available nitrogen. [16]

6. What are the common features of biological membranes? What are the major class of membrane lipids? [16]

7. ‘Free energy is the most useful thermodynamic function in Biochemistry’Illustrate your answer with suitable metabolic pathway. [16]

8. What are the structural features of photosystem I and II. How do you separate them from each other from the thylakoid membranes. What are the roles of these two photosystems. [16]