Molecular Basis of Inheritance Class 12 MCQs Questions with Answers

1. Nitrogenous bases present in DNA:

2. During transcription, the site of DNA molecule at which RNA polymerase binds is called

3. In transcription in eukaryotes, heterogenous nuclear RNA (hnRNA) is tmascribed by

4. In DNA strand, the nucleotides are linked together by

5. Okazaki fregments is:

6. The strand of DNA that forms mRNA is called?

7. During DNA synthesis formed segment is:

8. DNA fragments are joined in a correct sequence by :

9. The three codons which result in the termination of polypeptide chain synthesis are

10. The sequence of structural genes in lac operon is

11. The net electric charge on DNA and histone, is

12. The process of copying genetic information from one strand of DNA to RNA is termed as _________ .

13. In DNA helix:

14. If a double stranded DNA has 20% of cytosine, what will be the percentage of adenine in it ?

15. DNA double helix model was given by:

16. In some viruses, DNA is synthesised by using RNA as template. Such a DNA is called

17. The mutations that involve addition, deletion or substitution of a single pair in a gene are referred to as

18. Histone proteins are

19. Which one is mainly transcribed:

20. Which of the following steps in transcription is catalysed by RNA polymerase ?