Nalanda Open University
Annual Examination 2017
B.Sc. Botany (Honours), Part-III
Paper-VII (Cytogenic and Molecular Biology)
Time: 3.00 Hrs. Full Marks: 80
Answer any five questions. Questions No. 1 is compulsory. All questions carry equal marks.
1. Multiple choice questions
The core of nucleosome is made up of two molecules each of
H1, H2A, H2B H3
H1, H2A, H2B, H4
H1, H2A, H2B, H3, H4
M2A, H2B, H3, H4
Synthesis of RNA and proteins takes place in:
S-phase G1-phase
G1 G2 phase M-phase
The clover leaf structure of tRNA was given by:
Jacob Monad Hoagland Halley All of them.
Extra nuclear genes occur in
Mitochndria cyloplasm Ribosomes cytoplasm
ER Cytoplasm Cytoplasm only
The lowest level of chromosome organization is
Solenoid Nucleosome 30 nm fiber None of
these
Chromatin has:
DNA DNA and protein DNA, RNA and proteins
None of these.
The quickest method of plant breeding is
Introduction Selection
Hybridization Mutation breeding
(viii) Which of the following is not true of DNA
A pairs with T and G pairs with C
Nitrogen bases are 0.34 apart on a DNA strand
The double helix is 2.0 nm wide
The double helix is 3.4 nm wide.
2. Describe in detail chemical and physical structure of DNA
3. What is cell cycle? Explain its significance.
4. Define linkage? Give one example to explain linkage.
5. What do you understand by the term interaction of gene. Give one
example to explain it.
6. Describe different stages of mitosis. Explain its significance.
7. Write short notes on any two of the following.
Nucleosome Histone protein Euchromatin
8. Describe various methods adopted in plant breeding.
9. How can you prove that DNA is the genetic material?
10. Write short notes on
Types of RNA
Significance of meiosis