NEET DNA Structure MCQ Quiz Quiz Questions

1. DNA fingerprinting recognizes the differences in

A satellite DNA B bulk DNA C Repetitive DNA D both and

2. This force can stabilize a DNA double-helix

A Hydrophilic sugar-phosphate groups are found on the exterior of the helix where interaction with water occurs B Hydrophobic bases are present in the interior of the helix, each base-pair is stabilized by the same number of hydrogen bonds C covalent base stacking interactions may take place between neighbouring bases within the same strand in the helix D non-covalent N-glycosidic bonds may form between nitrogenous bases in opposite strands in the helix

3. In this type of DNA replication, of the two newly formed molecules, one is purely a new one and the other is an old one

A dispersive B conservative C semiconservative D both and

4. The process of DNA replication is affected by an enzyme known as

A Mutase B Ligase C Polymerase I D Ribonuclease

5. A DNA molecule in which both strands have radioactive thymidine is permitted to replicate in an environment that contains non-radioactive thymidine What is the right number of DNA molecules which possess some radioactive thymidine post three duplications?

A one such molecule B two such molecules C four such molecules D eight such molecules

6. If the DNA strand has nitrogenous base sequence ATTGCC, the mRNA will have?

A ATTGCA B UGGACC C UAACGG D ATCGCC

7. The type of coiling in DNA is

A Zig-zag B Left-handed C Opposite D Right-handed

8. In DNA, the enzyme which breaks the H

A Ligase B Helicase C Topoisomerase D Polymerase

9. The total DNA comprises what amount of cytoplasmic DNA in cells?

A 95-99% B 65-75% C 45-50% D 1-5%

10. The bases are held together in a DNA double helix by hydrogen bonds These bonds are

A Ionic bonds B Covalent bonds C Non-covalent bonds D Van der Waals forces