BIOCHEMISTRY Question Papers (Supple, 2007 Feb, RR)

SET :1

1. (a) Explain glycosidic bond with N-glycosidic and O-glycosidic bonds.
(b) How can you distinguish between the two types of glycosidic bonds? [8+8]

2. Name the major forms of carbohydrates in animals? How do they differ from plant storage carbohydrates? Show the structural differences. [5+4+7]

3. (a) Write notes on saturated fatty acids.
(b) Describe peroxisomal beta oxidation. [8+8]

4. Describe the biosynthesis of any three essential aminoacids and add a note on their importance. [10+6]

5. Describe the pathways in the biosynthesis of aromatic amino acids. [16]

6. Calculate the bioenergetics involved in the aerobic oxidation of
(a) Glucose
(b) Acetyl coA
Write the specific reactions involved. [8+8]

7. What is the primary function of photosynthesis in plants and bacteria? Write the difference among them. [6+10]

8. What percentage of the sun’s energy reaching the earth is actually captured by plants in the form of organic compounds? Write a note on cyclic photophosphorylation. [4+12]


SET :2

1. (a) Discuss the structure of dextran polymer.
(b) What is the composition of lignin polymer? [8+8]

2. Explain the salient features of glycoproteins. Name the common sugar residues associated with glycoproteins High the functions of glycoproteins with examples [4+12]

3. Explain how palmitoyl Co A is oxidized. Add a note on energetics of process.[8+8]

4. Describe the common metabolic transformation reactions of aminoacids. [16]

5. Describe the pathways in the biosynthesis of aromatic amino acids. [16]

6. Describe the alternative pathway of glucose oxidation (pentose phosphate) in detail. [16]

7. When does photosynthesis occur? Differentiate Day and night patterns of photosynthesis. [4+12]

8. C4 plants are typical of highly luminous environments, and may be more affected by shade than C3 plants. Why do you think this may happen? [10+3+3]


SET :3

1. (a) Name the enzymes which can hydrolyze polysaccharides.
(b) Show with structures the site of action of the enzymes [6+10]

2. Illustrate the branching points of glycogen and starch polysaccharides. Explain the salient features of these polymers. [16]

3. Write the structures of any two fatty acids? Add a note on various roles of fatty acids. [6+10]

4. Write short notes on the following:
(a) Peptide bonds
(b) Aromatic amino acids
(c) Transaminations
(d) Nitrogen exretary products [4X4]

5. Discuss the pathways for the synthesis of aromatic amino acids? Also comment on the regulation of the pathways. [9+7]

6. “TCA cycle is the final common pathway of oxidation of carbohydrates, proteins and lipids”- Substantiate the statement. [16]

7. Write notes on
(a) chlorophylls and their role in trapping of solar energy
(b) anoxygenic photosynthesis [8+8]

8. Explain how the following factors affect photosynthesis: stomatal opening, temperature, light intensity, water availability, and CO2 availability. [3+3+4+3+3]


SET :4

1. (a) What are the terms used to denote sugars with 4-carbon, 5-carbon, 6-carbon and 7-carbons
(b) Write the structure of each one with an example? [4+12]

2. Illustrate the branching points of glycogen and starch polysaccharides. Explain the salient features of these polymers. [16]

3. Describe the regulatory steps in the biosynthesis of
(a) Cholesterol
(b) Fatty acids [8+8]

4. What aminoacids are converted to alpha keto glutarate. Write the importance of these aminoacid reactions. [4+12]

5. (a) What are different biosynthetic families of amino acids:- Bacteria and plant discuss briefly.
(b) What are the processors for amino acid biosynthesis. [8+8]

6. “TCA cycle is the final common pathway of oxidation of carbohydrates, proteins and lipids”-Substantiate the statement. [16]

7. Write a note on the Role of the Stroma and Thylakoid in photosynthesis process. [16]

8. What is Rubisco and what is its role in photosynthesis and photorespiration? [4+6+6]