BIOCHEMISTRY Question Papers (SUPPLE,2008)

SET-1

1. (a) Name the enzymes, which can hydrolyze polysaccharides.

(b) Show with structures the site of action of the enzymes.

2. Describe in detail the structure and function of lectins.
3. What are eicosanoids? Describe how arachidonic acid is formed from linoleic acid?
4. Write notes on nitrification, denitrification and ammonification processes.
5. (a) What are the different biosynthetic families of aminoacids- bacteria and plant describe briefly.

(b) What are the processors of aminoacid biosynthesis?

6. Describe the alternate pathway of glucose oxidation (pentose phosphate) in detail.
7. What is the primary function of photosynthesis in plants and bacteria? Write the difference among them.
8. Which part of photosynthesis uses water? What happens to the water?

SET-2

1. (a) Discuss the structure of dextran polymer.

(b) What is the composition of lignin polymer?

2. Write short notes:

(a) Lectins

(b) Glycosaninoglycans

(c) Glycoproteins

3. Describe the beta- oxidation pathway and calculate the energetics for the oxidation of palmitic acid.
4. Give any three reactions of aminoacids and add a note on titration curves.
5. (a) What are the different biosynthetic families of aminoacids- bacteria and plant describe briefly.

(b) What are the processors of aminoacid biosynthesis?

6. “TCA cycle is the final common pathway of oxidation of carbohydrates, proteins and lipids”- Substantiate the statement.
7. Why are there various pigments that form the “antenna complex” of the photosystems?
8. What are the primary products of photosynthesis and how do other organisms use them?

SET-3

1. (a) Name one each of amino sugars and sugar acids

(b) In which biological matter are they found?

(c) Discuss their importance

2. What are lectins? Where are lectins found in nature? Give suitable examples and their functions.
3. Write the structure and functions of the following:

(a) Palmitic acid

(b) Arachidonic acid

(c) Linoleic acid

(d) Alpha- Linoleic acid

4. What is a peptide linkage? Describe how aminoacid sequence determines primary structure of proteins.
5. Discuss the pathways for the synthesis of the aromatic aminoacids? Also comment on the regulation of the pathways.
6. Describe the pathways involved in:

(a) Glycogenesis

(b) Glycogenolysis

7. What unique role does the pigments of the “photochemical reaction center” of photo systems play?
8. How does photosynthesis occur? Write a note on light reaction and dark reaction.

SET-4

1. (a) Depict the core structure of any two polysaccharides.

(b) Distinguish between the important properties of starch and cellulose

2. What is a glycosidic bond? Illustrate with structures of suitable examples
3. Give an account of metabolism of triglycerols.
4. What is reductive deamination? Describe how ammonia is incorporated into organic molecules.
5. Describe the pathways in the biosynthesis of aromatic aminoacids.
6. Describe the pathways involved in:

(a) Glycogenesis

(b) Glycogenolysis

7. When does photosynthesis occur? Differentiate day and night patterns of photosynthesis
8. Why could animals evolve after photosynthetic organisms had been present on earth for more than a billion years?