M.Sc. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2017.
Third Semester
Botany
Paper I MOLECULAR BIOLOGY
(Common for Botany, Zoology, Biochemistry, Biotechnology and Microbiology Course)
2 17031
Time 3 Hours Max. Marks 70
SECTION — A
Answer any FIVE questions. 6 30 Marks)
1. Helicases
2. DNA Polymerases
3. Sigma cycle
4. Capping
5. Protein sorting
6. Protein targeting
7. Antisense RNA
8. Homeotic genes.
SECTION — B
Answer ALL questions. 10 40 Marks)
9. Describe DNA damage and repair.
Or
Write an account on the organization of DNA in Prokaryotes.
10. Describe the nature of RNA Polymerases in Eukaryotes.
Or
Describe elongation and termination of RNA synthesis.

11. Write an account on Protein synthesis.
Or
Write an account on inhibitors of Protein synthesis.
12. Describe regulation of gene expression in Prokaryotic Operon.
Or
Describe Hormones and environmental factors affecting gene expression.