Molecular Basis of Inheritance Class 12 MCQs Questions with Answers

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

2. The sequence of structural genes in lac operon is

3. Okazaki fregments is:

4. DNA double helix model was given by:

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

6. Nitrogenous bases present in DNA:

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

8. During DNA synthesis formed segment is:

9. Which one is mainly transcribed:

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

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

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

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

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

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

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

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

18. In DNA helix:

19. Histone proteins are

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