LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – ZOOLOGY

TS 27

SECOND SEMESTER – APRIL 2007

ZO 2800 – CELL BIOLOGY

 

 

Date & Time: 17/04/2007 / 1:00 – 4:00    Dept. No.                                                               Max. : 100 Marks

 

 

Part A                                                (Answer all)                                    10 X 2 = 20

1. What do you mean by resolving power of a microscope?
2. Differentiate nucleoid from nucleus.
3. Assess the symbiotic theory of origin of eukaryotes.
4. What are vital stains?
5. Comment on Balbiani rings.
6. Mitochondria is a semi autonomous cell organelle. Justify.
7. Mention the discoverers of the following:

1. a) Lysosomes
2. b) Nucleus
3. c) Nucleolus
4. d) Double helical DNA

1. What are T and B lymphocytes?
2. What are oncogenes?
3. Comment on cell diffusion.

Part B                         (Answer any four)                             4 X 10 = 40

 

1. Write notes on polymorphism in lysosomes.
2. Illustrate and explain the fluid mosaic model of plasma membrane.
3. Distinguish prokaryotic cell from eukaryotic cell.
4. Explain the ultra structure of SAT-chromosome.
5. Explain the principle involved in a compound microscope. In what way it differes from an electron microscope.
6. Write short notes on Sodium-Potassium pump.

 

   Part C                            (Answer any two)                             2 X 20 = 40

 

1. Illustrate the ultra structure of a mitochondrion and elaborate its functions.
2. Write an essay on transcription and translation.
3. Discuss “immune responses”.
4. Write notes on:

1. a) Structure of a cilium/flagellum.
2. b) Giant  chromosomes.

 

 

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