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)
- What is a dipeptide? Give an example.
- Define isoelectric point of an amino acid
- Draw the structure of fructose.
- What are fungicides? Give any two examples.
- Give the compositions of NPK fertilizers.
- What are isomerases? Give an example.
- Give an example for the optical specificity of an enzyme.
- Define iodine value of a fat.
- What are PUFA? Give any two examples.
- Draw the structure of papavarine and citral.
Part – B
Answer any EIGHT questions: (8 ´ 5 = 40 marks)
- Discuss in detail the primary structure of proteins.
- Give any two methods of synthesis of amino acids.
- How will you convert a hexose into pentose?
- Give a brief over view of Citric acid cycle.
- What are fertilizers? List the importance of the fertilizers.
- How are the following synthesized?
(a) 2,4-D (b) 2,4,5-T
- Explain the process of transcription in brief.
- What are coenzymes? Explain the significance of coenzymes in enzyme action.
- Mention the difference between plant and animal fats.
- Define rancidity of a fat? What are the two types of rancidity? Explain.
- What are lecithins and cephalins? Explain.
- Explain the factors affecting the enzymatic activity.
Part-C
Answer any FOUR questions: (4 ´ 10 = 40 marks)
- Discuss the classification of proteins based on their function.
- Describe in detail the different types of soil
- List the uses of insecticides. Give the method of synthesis of the following
- a) DDT b) BHC c) Organophosphates (3+4+3)
- What is enzyme inhibition? Discuss competitive and non-competitive inhibitions with examples.
- a.) Explain the classification of lipids with examples.
b.) Discuss the classification of alkaloids.
- Draw and explain the double helical structure of DNA.