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Cell Division and Functions

DNA polymeras...

Question

DNA polymerases are generally used in DNA replication

A

To cut the helix at certain places

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B

For proofreading

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C

For breaking and joining pieces of one DNA strand

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D

For adding carbonyl compound

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Solution

The correct option is B
For proofreading

Proofreading allows DNA polymerase to check each nucleotide during DNA synthesis and excise mismatched nucleotides in the 3´ to 5´ direction.

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Similar questions

Q. How many of the following statements are correct ?

A. DNA dependent DNA polymerase requires DNA primer for initiating replication but DNA dependent RNA polymerase does not require any primer for transcription.

B. DNA dependent DNA polymerase requires RNA primer for initiating replication but DNA dependent RNA polymerase does not require any primer for transcription.

C. During replication, unwinding of DNA double helix forms a fork-like structure called replication fork.

D. During transcription, unwinding of the DNA double helix by DNA dependent RNA polymerase forms a transcription bubble.

E. During transcription, unwinding of DNA double helix by DNA dependent RNA polymerase forms a transcription fork.

Q. Which of the following are correctly matched?
1. Ligase - Joins short segments of DNA together
2. DNA polymerase - cuts DNA at specific site
3. Helicase breaks hydrogen bond between complementary pairs during DNA replication

Q. Match List I(Enzyme) with List II(Function) and select the correct answer using the codes given the lists.

List-I	List-II
a. DNA Ligase	$1$ . Catalyses the covalent union of segments of an interrupted sugarphosphate strand in double-stranded DNA
b. DNA polymerase	$2$ . End nuclease that digests either single stranded or double stranded DNA
c. DNase I	$3$ . Produces single or double stranded breaks in DNA during replication to release tension brought about by the separation of double strands
d. DNA topoisomerase	$4$ . Catalyses the formation of DNA worn deoxyribonucleotides using one strand of DNA as template

Q. The DNA dependent DNA polymerases catalyse polymerisation only in one direction, that is ___(i)___. The replication is continuous on the template strand with polarity ___(ii)___ . Replication is discontinuous on the template strand with polarity ___(iii)___.

Select the correct option for (i), (ii) and (iii).
[0.7 mark]

Q. During the replication of DNA, one of the two strands is synthesized in pieces and are joined later in the presence of enzyme called

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