Molecular Biology  MCQs

1. Which of the following does not contain introns?

a) processed DNA

b) RNA

c) primary RNA transcript

d) processed DNA & RNA

2. At the end of the translation process we get?

a) amino acids

b) polypeptides

c) lipids

d) carbohydrates

3. Ozone depletion can be prevented by …

a) decrease the usage of CFC products

b) fossil fuels are used in factories

c) use of scrubbers

d) none of these

4. First DNA glycosylase is …

a) uracil DNA glycosylase

b) thymine DNA glycosylase

c) adenine DNA glycosylase

d) none of these

5. Which of the following is required for DNA replication?

a) primase

b) helicase

c) DNA polymerase

d) all of these

6. What is used to bind GTP?

a) oncogene R

b) oncogene D

c) oncogene

d) none of these

7. How many RNA polymarses are there in the bacterial system?

a) 1

b) 2

c) 3

d) 4

8. All viruses consisted of ….

a) nucleic acid and protein coat

b) DNA & RNA coat

c) DNA protein coat

d) none of these

9. For polypeptide chain formation it’s genetic information is carried out   by _____  to the ribosome?

a) tRNA

b) mRNA

c) rRNA

d) none of these

10. Which  of the following has single subunit?

a) bacillus subtilis polymerase

b)  E.coli

c) T7 RNA polymerase

d) all of these

11. Which one is the negative regulator of trp operon?

a) lactose

b) allolactose

c) C-AMP

d) tryphotophan

12. E.coli RNA polymerase conisits of _____ subunits?

a) 1

b) 4

c) 5

d) 3