BIOCHEMISTRY Question Papers (SUPPLE,2008) - 1

SET-1

1. What are the organisms contain a variety of hexose derivatives.
2. How the sugar level of blood is maintained in animal? Discuss the role of hormones in sugar regulation in the animal body.
3. Write short notes:

(a) Glycerol 3-phosphate shuttle.

(b) Heat generation by uncoupled mitochondria.

4. Describe proteins conformation is stabilized largely by weak interaction.
5. Which are the aminoacids derived from 3-phosphoglycerate. Enumerate the biosynthetic pathways of these aminoacids.
6. “Citrate carries acetyl groups from mitochondria to the cytosol for fattyacid synthesis”- explain with suitable illustration.
7. How does cells synthesize the building blocks of their macromolecules?
8. What is photosynthesis? What are the early concepts on photosynthesis? Give the basic equation of photosynthesis. Where do the primary events of photosynthesis occur?

SET-2

1. What are the organisms contain a variety of hexose derivatives.
2. Discuss the Embeden-Meyerhoff pathway with structures.
3. What do you understand by “redox” reaction? Write a note on oxidation versus reduction in the biological systems.
4. Describe proteins conformation is stabilized largely by weak interaction
5. What is nitrogen cycle? Sketch the basic events involved in it. What are the enzymes involved in this cycle?
6. What are the common features of biological membranes? What are the major classes of membrane lipids?
7. Enumerate the different stages involved in the extraction of energy from foodstuffs. Outline the major pathways involved in this process
8. What is the mechanism, of trapping the solar energy? What are the primary and secondary photoreceptor molecules? Explain the structural characteristics of chlorophylls.

SET-3

1. Write short notes:

(a) Gangliosides

(b) Lipopolysaccharides

2. What is Gluconeogenesis? Describe the major metabolic pathways involved in this process. Write a note on its regulation
3. What is proton motive force? Write a note on the energy of electron transfer which is efficiently conserved in a proton gradient
4. Write short notes:

(a) Stereoisomerism in alpha aminoacids

(b) Zwitterions.

5. (a) List out the aminoacids that are synthesized from citric acid cycle intermediates. Sketch the biosynthesis of any of them.

(b) Explain the mechanism of transamination with a suitable example.

6. (a) What are ceramides and sphingolipids? Give their structural features and mention their biological roles.

(b) What are glycosphingolipidsand cerebrosides? Mention their structural features.

7. Enumerate the different stages involved in the extraction of energy from foodstuffs. Outline the major pathways involved in this process.
8. How a protein gradient is formed as electrons flow from photosystem II to I. Give the structural features of plastoquinone and plastocyanin. What is their role in photosystem-II?

SET-4

1. Explain the structure and roles of some polysaccharides.
2. Explain how gluconeogenesis converts fats and proteins to glucose in germinating seeds.
3. Explain ATP Synthase has two functional domains.
4. Describe proteins conformation is stabilized largely by weak interaction.
5. What are the precursors for phenylalanine and tyrosine? Discuss the biosynthesis of these two aminoacids.
6. Write a detailed note on the hydrolysis of triglycerols mediated by c-AMP.
7. (a) What are the products obtained under the anaerobic conditions in skeletal muscle and in microorganisms?

(b) Sketch the biogenesis of ethanol.

How do the tropical plants carry out photosynthesis? Which are the major sites of photosynthesis in these plants.