Q7/19C/03-14 Reg. No

St. Joseph’s College of Arts & Science (Autonomous) St. Joseph’s College Road, Cuddalore – 607001 PBC701 – BIOORGANIC CHEMISTRY

Time : 3 hrs

Max Marks :75 SECTION – A (15X1=15) Answer ALL Questions

I. Choose the correct answer 1. Which of the following is not a disaccharide? a) Maltose b) Galactose c) Lactose

d) Sucrose

2. Proteins are the polymeric forms of a) D-α-aminoacids b) L-α-aminoacids c) D-β-aminoacids d) L-β-aminoacids 3. Which of the following is an odd chain saturated fatty acid? a) Oleic acid b) Capric acid c) Valeric acid d) Stearic acid 4. Ribose and deoxy ribose differ in their structure around the carbon atom a) 2 b) 4 c) 2 and 4 d) 1 and 4 5. Leucine zipper consists of multiple leucine residues at ___ residue intervals a) 5 b) 10 c) 7 d) 9 II. Say true or false 6. Heparin is a polymer of repeated units of D-glucuronate-2-sulfate. 7. A dipeptide has two peptide bonds.

~1~

Q7/19C/03-14 8. Both fats and oils are chemically triacylglycerols. 9. Under high salt concentrations usually the DNA exist in ‘Z’ form. 10. In zinc finger the zinc ion is coordinated by two histidine and two cytidine residues. III. Answer in one sentence 11. What are glycoproteins? 12. What is FDNB? Mention its use. 13. Mention the components of waxes. 14. What are nucleosomes? 15. What is the role of DNA binding motifs in protein? SECTION – B (5X4=20) Answer ALL Questions 16. a) Write short notes on blood group antigens. (or) b) Explain the occurrence, structure and biological functions of cellulose. 17. a) Elaborate the structural features of haemoglobin. (or) b) Describe the importance of Ramachandran plot. 18. a) Give an account on structure and functions of cholesterol (or) b) What are glycolipids? Explain with examples? 19. a) Elaborate the structural features of different forms of DNA.

~2~

Q7/19C/03-14 (or) b) Define denaturation and describe the properties of denatured DNA. 20. a) Write short notes on bHLH motif. (or) b) Explain the importance of DNase I footprinting. SECTION- C (4X10=40) Answer any FOUR Questions 21. What are glucans? Describe the structure and functions of starch and glycogen. 22. Give a detailed account on the structural organizations of proteins. 23. What are lipids? How they are classified? Explain 24. Give a brief account on structure and functions of phospholipids. 25. Describe the structural features of different types of RNA. Add a note on their functions. 26. Give a detailed account on zinc finger and leucine zipper.

***********

~3~