7. What is the interaction involved in purine and pyrimidine base hybridization process

(A)  Vandar waal interaction

(B)  Hydrophobic interaction

(C)  Ionic interaction

(D)  Hydrogen bond

8. Southern hybridization is process to detect

(A)  DNA

(B)  RNA

(C)  Protein

(D)  All of the above

9. Probe is generally used in

(A)  Amplification process

(B)  Hybridization process

(C)  Restriction digestion process

(D)  all of the above

10. When nick occurs in DNA strand, it

(A)  exposes 3′- OH termini and 5′-PO₄ termini

(B)  exposes 3′ PO₄ - termini and 5′- OH termini

(C)  addition of nucleotide to free ‘ –OH group.

(D)  None of the above

11. Transversion mutation is

(A)  substitution of puine base by pyrimidine or vice versa

(B)  substitution of puine by purine base

(C)  substitution of pyrimidine by pyrimidine base

(D)  None of the above

12. UV radiation causes damage to DNA strand by

(A)  Dimerization of purine bases

(B)  Dimerization of pyrimidine bases

(C)  Deletion of nucleotide bases

(D)  None of the above