MCQ ON DNA REPLICATION class 12 for NEET

MCQ ON DNA REPLICATION class 12 for NEET | THE DNA REPLICATION class 12 | MCQ DNA REPLICATION with Answer | Check the below NCERT MCQ question for class 12 Biology chapter 06 based on the with Answers.

MCQ on DNA REPLICATION class 12 Biology with answers were prepared based on the latest pattern.We have provided class 12 Biology MCQs questions on DNA REPLICATION with Answers to help students understand the concept very well.

MCQ ON DNA REPLICATION is useful for NEET / CSIR / UGC / CBSE / ICSE / AIIMS / EXAM / AFMC EXAM / STATE LEVEL MEDICAL EXAM 2022-23, 2023-24

Introduction:
DNA is a long polymer of deoxyribonucleotides. The length of DNA is usually defined as the number of nucleotides present in it.This also is the characteristics of an organisms. DNA acts as a genetic materials in most of the organisms. DNA replication main enzyme is DNA dependent DNA polymerase, since it uses a DNA template to catalyse the polymerisation of deoxyribonucleotides. These enzyme are highly efficient enzyme.

 

MCQ ON DNA REPLICATION class 12 for NEET

1. The process of multiplication of DNA from DNA is known as

(a) Replication
(b) Duplication
(c) Transcription
(d) Translation

Ans (a) Replication

2. The area of unwinding and separation of DNA strands during replication is called

(a) origin
(b) initiation point
(c) primer
(d) replication fork

Ans. (a) origin

3. Topoisomerase is involved in

(a) producing RNA primer
(b) joining of DNA segments
(c) Producing Nick in DNA
(d) Separation of DNA strands

Ans. (c) producing Nick in DNA

4.Okazaki segments are

(a) small segment of RNA
(b) small peptides
(c) small DNA segments
(d) small DNA segments formed over DNA template running in 3′—–5′ direction.

Ans.(d) small DNA segments formed over DNA template running in 3′——5′ direction.

5. Okazaki fragments give rise to

(a) master strand
(b) sense strand
(c) lagging strand
(d) leading strand

Ans.(c) lagging strand

6. Leading strand during DNA replication is formed

(a) continuosly
(b) In short segments
(c) First
(d) ahead of replication

Ans.(a) continuously

7. DNA acts as a template for synthesis of

(a) DNA
(b) RNA
(c) proteins
(d) Both DNA and RNA

Ans.(d) both DNA and RNA

8. In polypeptide synthesis amino acid are brought over ribosomes ,mRNA complex by

(a) rRNA
(b) tRNA
(c) DNA
(d) nucleotides

Ans.(b) tRNA

9. New strand formation on a DNA template can be initiated only by

(a) DNA polymerase |
(b) DNA polymerase |||
(c) RNA primer
(d) DNA primer

Ans. (c) RNA primer

10. DNA replication is

(a) conservation and discontinuous
(b) semiconservative and semidiscontinuous
(c) semiconservative and discontinuous
(d) conservative

Ans. (b) semiconservative and semidiscontinuous

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11. Experimental material in the study of DNA replication has been

(a) Escherichia coli
(b) Neurospora crassa
(c) Pneumococcus
(d) Drosophila melangoster

Ans.(a) Escherichia coli

12.During DNA replication , the strands separate by

(a) DNA polymerase
(b) Topoisomerase
(c) Unwindase/Helicase
(d) Gyrase

Ans . (c) Unwindase/Helicase

13. Protein helping in opening of DNA double helix in front of replication fork is

(a) DNA Gyrase
(b) DNA polymerase 1
(c) DNA ligase
(d) DNA Topoisomerase

Ans.(a) DNA Gyrase

15. The enzyme taking part in joining two ends / fragments of DNA is

(a) Ligase
(b) Polymerase
(c) Gyrase
(d) Helicase

Ans. (a) ligase

16.DNA synthesis can be measured by estimating incorporation of radio – labelled

(a) uracil
(b) ribose sugar
(c) thymidine
(d) adenine

Ans.(c) thymidine

17. Enzyme required for removing RNA primer during DNA replication is

(a) Primase
(b) ligase
(c) DNA polymerase |||
(d) DNA polymerase |

Ans.(d) DNA polymerase |

18. Enzyme catalysing synthesis of RNA over DNA template is

(a) DNA polymerase
(b) RNA polymerase
(c) Reverse transcriptase
(d) Endonuclease

And.(b) RNA polymerase

19. Isotopes used in proving semi-conservative replication of DNA were

(a) 14N, 14C
(b) 14C, 31P
(c) 14N, 15N
(d) 14N, 31P

Ans. (c) 14N, 15N

20. DNA polymerase take part in

(a) Transcription
(b) splicing
(c) replication
(d) teminism

Ans.(c) replication

21.In eukaryotes, the replication of DNA takes place at

(a) G1 phase
(b) S phase
(c) G2 phase
(d) G0 phase

Ans. (b) S phase