Molecular Biology  MCQs

By: Prof. Dr. Fazal Rehman | Last updated: May 14, 2025

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 polymerases 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 its 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 a 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 the trp operon?
(A) lactose
(B) allolactose
(C) C-AMP
(D) tryptophan

12. : E. coli RNA polymerase consists of _____ subunits?
(A) 1
(B) 4
(C) 5
(D) 3