Which of the following enzymes would a bacterium most likely use to prevent its DNA from being chopped up by its own restriction enzymes?
A) DNA polymerase
B) Ligase
C) Lactase
D) Reverse transcriptase
E) Methylase

Question

Quizplus · Accepted Answer

Methylase adds a methyl group to a specific nucleotide sequence in the bacterial DNA, which prevents the restriction enzymes of the same bacterium from cutting it. This is a common mechanism used by bacteria to protect their own DNA from being degraded. DNA polymerase is involved in DNA replication, ligase joins DNA fragments together, lactase is involved in lactose metabolism, and reverse transcriptase is an enzyme found in retroviruses that converts RNA to DNA. None of these enzymes would be involved in protecting bacterial DNA from restriction enzymes.

Which of the Following Enzymes Would a Bacterium Most Likely