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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI 600 034
M.Sc. DEGREE EXAMINATION BIOTECHNOLOGY
FIRST SEMESTER NOVEMBER 2017
17/16PBT1MC01 CELL AND DEVELOPMENTAL BIOLOGY
Date: 02-11-2017 Dept. No. Max. 100 Marks
Time: 01:00-04:00
PART A
Answer ALL the Questions
I. Choose the correct answer x 1 5 Marks)
1. What is the magnification power of an electron microscope?
10,000 X 100 X 10,00 X 100,000X
2. Receptor is always a
Protein lipid Fatty acid CHO
3. Which is the following is the stem cell of an egg?
Oogonia Ootid Ovum Yolk
4. In which of the following segment is antennapedia expressed?
First second third fourth
5. What does SAM stand for?
Shoot Apical Meristem Stem Apical Meristem
Side Apical Meristem Strong Apical Meristem
II. State whether the following are true or false. (5x1=5 Marks)
6. Two daughter cells are seen in telophase.
7. Secondary messengers are seen only in G-protein mediated signal transduction.
8. C. elegans is a good model system to study the cell lineage in an eukaryote.
9. Hox genes are homologous to Homeotic selector genes.
10. Pattern formation can be studied in the embryo formation of a seed.
III. Complete the following x 5 Marks)
11. Chloroplast DNA is of origin.
12. 40% of the extracellular matrix composed of
13. has got communicating function between cells.
14. destroys the maternal mRNA in Drosophila.
15. solute and electrical current to pass through between cells.
IV. Answer the following within 50 words x 1 5 Marks)
16. Mention any one function of cell dependant kinase
17. What are cell adhesion molecules?
18. Define commitment of cells in humans
19. What are energids?
20. On which day of foetal development a human blastoceal is formed?
PART B
Answer the following each within 500 words. Draw diagrams and flowcharts wherever necessary.
x 8 40 marks)
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21. Compare and contrast mitosis and meiosis.
OR
Describe stages of a cell cycle and discuss its regulation.
22. Explain the cell signaling pathway, where secondary messengers are involved.
OR
Discuss Erythropoetin signaling.
23. (a)Describe the steps in the formation of a human blastocyst.
OR
Explain how an embryosac is formed?
24. Write an account on:
i. Sex determination in Drosophila ii. Dosage compensation in humans
OR
Explain vulval induction in C.elegans
25. Discuss the structure and function of Shoot Apical Meristem (SAM).
.
OR
Distinguish between a monocot and dicot.
PART C
Answer any TWO of the following, each within 1500 words. x 20 40 Marks)
Draw diagrams wherever necessary.
26. Write in detail about cytoskeleton
27. Describe two types of receptors.
28. Explain fertilization and dorsal ventral patterning in Drosophila.
29. Describe Oogenesis in humans.