Question

The enzyme referred to as 'Molecular scissors' is
(1) DNA Ligase
(2) DNA Polymerase
(3) Restriction Endonuclease
(4) Reverse transcriptase

Answer 1

Answer:

The enzyme referred as 'Molecular scissors' is Restriction Endonuclease.

Explanation:

Restriction Endonuclease enzymes cleave DNA at specific recognition sequences known as restriction sites.

Restriction enzyme term was originated from lambda phase studies. These enzymes create an incision on each strand of DNA. These cleavage of DNA by restriction enzymes are categorized either sticky ends or blunt ends. These restriction enzymes work at specific temperature to cleave the both strands of DNA. Restriction enzymes recognize mostly 6 nucleotide and 4 nucleotide recognition sites at the DNA strands.

Restriction endonucleases are broadly classified into 4 groups based on composition, nature of cleavage site and co-factor requirements.

Answer 2

The correct answer to your question is option (C)

Restriction endonuclease

Restriction endonuclease can also be known as restriction enzyme that cleaves DNA into pieces in specific site. To cleave a DNA strand the restriction enzyme must have to pick two perfect spot from the strand to make two incisions. Most of this kind of restriction enzyme can be easily spotted in bacteria which work as a defense mechanism against virus.