ZOO/VI/09 Student's Copy
2 0 1 8
6th Semester
ZOOLOGY
Paper ZL-IX
Molecular Biology and Genetics
Full Marks 55
Time 2½ hours
PART A—OBJECTIVE
Marks 20
The figures in the margin indicate full marks for the questions
SECTION—A
Marks 5
Tick the correct answer in the brackets provided 1×5=5
1. The RNA that brings amino acids to ribosomes during translation is
mRNA
tRNA
rRNA
None of the above
2. Damage to a single nitrogenous base is repaired by the enzyme
glycosylase in
base excision repair
nucleotide excision repair
double-strand breakage
None of the above
/508 1 Contd.
3. Three structural genes are involved in
transcription
translation
lac operon
None of the above
4. A cross between red and white flowers leads to pink flower in the
F1 generation and the condition is called as
codominance
incomplete dominance
epistasis
multiple allelism
5. Change in entire sets of number of chromosomes is called as
aneuploidy
euploidy
monosomy
trisomy
SECTION—B
Marks 15
Write short notes on the following 3×5=15
1. Euchromatin
2. Mismatch repair
3. Characteristics of genetic code
4. Pleiotropism
5. Haemophilia
ZOO/VI/09/508 2 Contd.
PART B—DESCRIPTIVE
Marks 35
The figures in the margin indicate full marks for the questions
1. Describe the structure of DNA with suitable diagram. 7
OR
Write the structure and functions of polytene chromosome with diagram.
2. Explain the mechanism of DNA replication by semi-conservative method
with diagram. 7
OR
Explain the method of DNA repair by base excision and nucleotide excision
processes with diagrams.
3. Explain the process of translation in prokaryotic cell. 7
OR
Describe the process of transcription in prokaryotic cell with diagram.
4. Explain cytoplasmic inheritance with suitable example. 7
OR
Write notes on the following 3½+3½=7
Law of segregation
Codominance
5. What is mutation? Write down the causes and types of mutation.
OR
Write notes on the following 3½+3½=7
Crossing over
Klinefelter's syndrome