Q2/8J/04-15 Reg. No

St. Joseph’s College of Arts & Science (Autonomous) St. Joseph’s College Road, Cuddalore – 607001 BC203S - BIOMOLECULUS-II

Time : 3 hrs

Max Marks :75 SECTION – A (25X1=25) Answer ALL Questions

I. Choose the correct answer 1. The four subunits of the hemoglobin (Hb) gene represent protein's a. Primary structure b. Secondary structure c. Tertiary structure d. Quaternary structure 2. Which of the following amino acids can form hydrogen bonds with their side (R) groups? a. Asparagine b. Aspartic acid c. Glutamine d. All of these 3. The isoelectric point of an amino acid is defined as the pH a. Where the molecule carries no electric charge b. Where the carboxyl group is uncharged c. Where the amino group is uncharged d. Of maximum electrolytic mobility 4. An essential amino acid is one that a. Is essentially easy to synthesize b. Is essential to flagella motion c. The body cannot synthesize d. The body can synthesize under essential conditions 5. Which of the following is a nonprotein amino acid? a. Dopamine b. Hydroxylysine c. Cystine d. None of these

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6. Triacylglycerols are a. Soluble in water b. Insoluble in water c. Soluble in water at elevated temperature d. Partially soluble in water 7. Phospholipid contains a. Hydrophilic heads and hydrophobic tails b. Long water-soluble carbon chains c. Positively charged functional groups d. Both (b) and (c) 8. Glycine and proline are the most abundant aminoacids in the structure of a. Hemoglobin b. Myoglobin c. Insulin d. Collagen 9. Unsaturated fatty acids is known as a. Non-essential fatty acids c. Cerebrosides

b. Essential fatty acids d. Phospholipids

10. Iodine number is a measure of a. Degree of unsaturation of a fat b. Degree of rancidity of a fat c. Measure of volatile fatty acids in a fat d. Measure of number of OH groups in a fat II. Say true or false 11. Arachidonic acid is a relatively non essential fatty acid. 12. Sphingosine is not present in Cerebrosides. 13. Glutathione is a peptide which is cyclic in nature. 14. Insulin increases during glycogenesis process. 15. Isoelectric pH is that pH at which protein is electrically neutral.

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III. Answer in one or two sentences 16. Define Protein. 17. Give any two essential aminoacids. 18. What is denaturation of protein? 19. Define Saponification. 20. Define emulsification. 21. Define Zwitter ion. 22. Structure of hemoglobin. 23. Give an examples of fibrous proteins. 24. Give the functions of insulin. 25. What are lipoproteins? SECTION – B (4X5=20) Answer any FOUR Questions 26. Explain briefly on function of phospholipids. 27. Classify amino acids. 28. List and explain few of the amino acids that do not occur in proteins. 29. Describe the primary structure of protein. 30. Give the structure and function of globular proteins. 31. Write short notes on Ramachandran plot.

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SECTION – C (3X10=30) Answer any THREE Questions 32. Elaborate on the classification of proteins based on its size, shape and function. 33. Write short notes on Colour reaction of amino acids. 34. Give a short note on structure of protein. 35. Determine the amino acid sequence by N – terminal method. 36. Write structure and functions of biologically important peptides.

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