LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

FOURTH SEMESTER – APRIL 2012

CH 4204 – CHEMISTRY FOR BIOLOGISTS – II

 

 

Date : 19-04-2012              Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

 

Part- A

Answer ALL questions:                                                                                                         (10 ´ 2 = 20 marks)

1. What is a dipeptide? Give an example.
2. Define isoelectric point of an amino acid
3. Draw the structure of fructose.
4. What are fungicides? Give any two examples.
5. Give the compositions of NPK fertilizers.
6. What are isomerases? Give an example.
7. Give an example for the optical specificity of an enzyme.
8. Define iodine value of a fat.
9. What are PUFA? Give any two examples.
10. Draw the structure of papavarine and citral.

Part – B

 Answer any EIGHT questions:                                                                                            (8 ´ 5 = 40 marks)

11. Discuss in detail the primary structure of proteins.
12. Give any two methods of synthesis of amino acids.
13. How will you convert a hexose into  pentose?

1. Give a brief over view of Citric acid cycle.

15. What are fertilizers? List the importance of the fertilizers.
16. How are the following synthesized?

(a) 2,4-D          (b) 2,4,5-T

17. Explain the process of transcription in brief.

1. What are coenzymes? Explain the significance of coenzymes in enzyme action.
2. Mention the difference between plant and animal fats.
3. Define rancidity of a fat? What are the two types of rancidity? Explain.
4. What are lecithins and cephalins? Explain.
5. Explain the factors affecting the enzymatic activity.

 

 

Part-C

   Answer any FOUR questions:                                                                                       (4 ´ 10 = 40 marks)

23. Discuss the classification of proteins based on their function.
24. Describe in detail the different types of soil
25. List the uses of insecticides. Give the method of synthesis of the following
26. a) DDT b)   BHC    c)  Organophosphates                                    (3+4+3)
27. What is enzyme inhibition? Discuss competitive and non-competitive inhibitions with examples.
28. a.) Explain the classification of lipids with examples.

b.) Discuss the classification of alkaloids.

28. Draw and explain the double helical structure of DNA.

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & ADV. ZOOLOGY

THIRD SEMESTER – APRIL 2012

CH 3104 – CHEMISTRY FOR BIOLOGISTS – I

 

 

Date : 28-04-2012              Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

Part A

Answer ALL questions.                                                                                                (10 x 2 = 20 Marks)

 

1. What is intermolecular hydrogen bonding? Give an example.
2. Why the bond angle of water is reduced to 104° when compared with the normal tetrahedral angle?
3. Calculate the pH of 0.001N HCl.
4. Define the rate of a reaction.
5. Mention any two differences between order and molecularity.
6. Give any two examples for enzymes used in industries.
7. Draw the resonance structures of phenol.
8. Define Brownian movement.
9. How is maleic acid differentiated from fumaric acid?
10. Why is chlorophenol more acidic than phenol?

 

Part B

Answer any EIGHT questions.                                                                                      (8 x 5 = 40 Marks)

 

11. Explain the hybridization and shape of PCl₅.
12. State the postulates of Werner’s theory of coordination compounds.
13. Draw the structure of chlorophyll and explain any three functions.
14. Explain any five requirements for a primary standard solution.
15. Differentiate homogeneous and heterogeneous catalysis with examples.
16. Derive an expression for the rate constant of a first order reaction.
17. What is peptisation? Explain with an example.
18. Explain any two methods for the separation of a racemic mixture.
19. Discuss the optical isomerism of lactic acid.
20. Explain the types of polymerization with an example for each.
21. What is electro-osmosis? Explain.
22. Explain the vulcanization of rubber in detail.

 

 

 

 

Part C

Answer any FOUR questions.                                                                                     (4 x 10 = 40 Marks)

 

23. Explain the optical isomerism in square planar and octahedral complexes.
24. What are buffer solutions? Derive Henderson equation for an acidic buffer.
25. Explain electrophoresis in detail.
26. Define steric acceleration and steric hindrance. Explain with an example for each.
27. How are the following prepared?
28. i) nylon ii) terylene iii) neoprene                iv) PVC
29. Explain in detail the optical isomerism of tartaric acid.

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & ADV. ZOOLOGY

FIRST SEMESTER – NOVEMBER 2012

CH 1100 – CHEMISTRY FOR BIOLOGISTS – I

 

 

Date : 03/11/2012             Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

 

 

Part – A

Answer all the questions:                                                                                                            (10 × 2 = 20)

1. Define relative error.
2. Why TLC is superior to paper and column chromatography?
3. What are adsorbents? Give an example.
4. What is intermolecular hydrogen bonding? Give an example.
5. What is dipole – dipole interaction?
6. What are hormones?
7. Define normality?
8. What is enzyme catalyst?
9. Give the source and deficiency of vitamin A.
10. Draw the structure of vitamin E.

 

Part – B

Answer any eight questions:                                                                                                       (8 × 5 = 40)

11. Mention five points of handling of acids.
12. Explain the factors affecting R_f
13. Discuss the crystal structure of CsCl.
14. What are the factors involving the formation of ionic bond?
15. Discuss the hybridization and geometry of CH₄ and H₂
16. List the postulates of Werner’s theory.
17. Discuss the geometrical isomerism of octahedral complexes.
18. Give the difference between molecularly and order.
19. Discuss the occurrence and composition of fats.
20. What is the biological effects and thyroid hormones?
21. Explain the mechanism of acid buffer.
22. What are secondary standard solutions and how are they standardised?

 

 

 

 

Part – C

Answer any four questions:                                                                                                   (4 × 10 = 40)

23. What are the prerequisites for choosing adsorbents?
24. Describe the three types of adsorbents with suitable example.
25. a) Discuss the optical isomerism of octahedral complexes.(7)
26. b) What are polydentate ligands? Give an example. (3)
27. a) What is rate law? Derive the rate expressions for I order reactions.(5)
28. b) What are the prerequisites for the preparation of primary standard solutions?(5)
29. What is catalyst? Explain homogeneous and heterogeneous catalyst with suitable example.
30. Explain in detail the structure and function of vitamin A, C, D, K and E.

 

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & ADV. ZOOLOGY

THIRD SEMESTER – NOVEMBER 2012

CH 3104 – CHEMISTRY FOR BIOLOGISTS – I

 

 

Date : 07/11/2012             Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

SECTION – A

Answer all the questions:                                                                                                               10 × 2 = 20

1. Mention any four important properties of ionic compounds.
2. Define molarity.
3. What is the biological significance of hemoglobin?
4. What is a buffer solution?
5. State rate law.
6. Give any two examples for zero order reaction.
7. What are lyophilic colloids? Give an example.
8. Mention two applications of colloids in medicine.
9. How is nylon-6,6 prepared?
10. Draw the resonance structure of aniline.

SECTION – B

Answer any eight questions:                                                                                                            8 × 5 = 40

11. Write a note on dipole-induced dipole interaction.
12. Explain the various factors affecting the formation of ionic bond.
13. Describe the geometrical isomerism in square planar complexes.
14. Calculate the normality and molarity of a solution of H₂SO₄8 g/l.
15. Explain the buffer action using acidic buffer.
16. Differentiate homogeneous catalysis from heterogeneous catalysis.
17. Derive an expression for the first order rate equation.
18. What is electro osmosis?
19. Explain coagulation?
20. Explain the types of polymerization with an example for each.
21. How will you convert natural rubber into hard rubber?
22. What is mesomeric effect? Explain.

SECTION – C

Answer any four questions:                                                                                                          4 X 10 = 40

23. a) Draw the crystal structure of NaCl and explain.
24. b) What is meant by hybridisation?                       (6+4)
25. What are primary and secondary standard solutions? Explain the important characteristics of a primary standard solution.
26. a) Explain Michaelis – Menten equation.
27. b) What are catalytic poisons? (8+2)
28. Explain the optical and kinetic properties of colloids.
29. a) Describe the optical isomerism exhibited by tartaric acid.
30. b) What are polydentate ligands? Give an example. (7+3)
31. a) Mention the differences between HDPE and LDPE
32. b) What are homo and co polymers? Give an example for each type. (5+5)

 

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