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Question

An enzyme catalysing the removal of nucleotides from the ends of DNA is: 


Your Answer
A
Endonuclease
Correct Answer
B
Exonuclease
Your Answer
C
DNA ligase
Your Answer
D
Hind II

Solution

The correct option is B Exonuclease
Restriction enzymes belong to a class of enzymes called nucleases and are of two types.
(i) Exonucleases remove nucleotides from the ends of the DNA.
(ii) Endonucleases make cuts at specific positions within the DNA. DNA ligase is sealing enzyme (also called as genetic gum), which is responsible for joining of two individual fragments of DNA, whereas Hind II was first discovered restriction endonuclease enzyme.

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