B.Sc. I - Semester Examination
BS-IS/11
227566
BOTANY
Course No.: 101
Time Allowed: 3 hours Maximum Marks: 80
BS-IS/11
227566
BOTANY
Course No.: 101
Time Allowed: 3 hours Maximum Marks: 80
Note:
All the parts of Section-I are compulsory.
SECTION - I(10×2=20)
1. i) Two major differences in the Fluid mosaic model and lamellar model of structure of plasma membrane.
ii) Mention the
major function of Golgi body.
iii) What is satellite DNA?
iv) What mainly controls cell division?
v) Basic difference in secondary and tertiary structure of protein.
vi) What do you mean by degeneracy of genetic code?
vii) How auto polyploids are produced artificially?
viii) How trisomics differ from monosomics?
ix) Differentiate between transitions and transversions.
x) Mention DNA repair mechanisms in prokaryotes.
iii) What is satellite DNA?
iv) What mainly controls cell division?
v) Basic difference in secondary and tertiary structure of protein.
vi) What do you mean by degeneracy of genetic code?
vii) How auto polyploids are produced artificially?
viii) How trisomics differ from monosomics?
ix) Differentiate between transitions and transversions.
x) Mention DNA repair mechanisms in prokaryotes.
SECTION - II
UNIT - I
Note: Attempt One question from each unit.
2. Discuss the ultra structure of mitochondria. Why is it called a semi-autonomous cell organelle? (12)
3. Write brief notes on the following: (5+7=12)
a) Structure of primary cell wall of plants.
b) Structure and functions of endoplasmic reticulum.
5. Write a note on the following: (4×3=12)
a) Structure and function of centromere.
b) Mitochondrial DNA.
c) Different DNA polymerases in bacteria.
7. Write short notes on the following: (6×2=12)
a) Structure of Nucleosome.
b) Structure of t RNA.
9. What are polyploids? Mention its different types. Discuss the role of autopolyploids in plant breeding. (12)
11. Write short notes on the following:
a) Ac-Ds system in maize. (5)
b) Mendel’s law of independent assortment. (7)
2. Discuss the ultra structure of mitochondria. Why is it called a semi-autonomous cell organelle? (12)
3. Write brief notes on the following: (5+7=12)
a) Structure of primary cell wall of plants.
b) Structure and functions of endoplasmic reticulum.
UNIT - II
4. With suitable diagrams explain the different stages of
mitosis. Also comment upon the significance of mitosis. (12)5. Write a note on the following: (4×3=12)
a) Structure and function of centromere.
b) Mitochondrial DNA.
c) Different DNA polymerases in bacteria.
UNIT - III
6. Discuss the mechanism of translation in bacteria. (12)7. Write short notes on the following: (6×2=12)
a) Structure of Nucleosome.
b) Structure of t RNA.
UNIT - IV
8. What are reciprocal translocations? Describe the meiotic
behavior in an organism heterozygous for these. (12)9. What are polyploids? Mention its different types. Discuss the role of autopolyploids in plant breeding. (12)
UNIT - V
10. Discuss the mechanisms of origin of spontaneous
mutations. (12)11. Write short notes on the following:
a) Ac-Ds system in maize. (5)
b) Mendel’s law of independent assortment. (7)
