DNA is protected from restriction enzymes by being
A) sequestered in a lysosome.
B) turned into RNA.
C) methylated.
D) made into double-stranded RNA.
E) phosphorylated.

Question

Quizplus · Accepted Answer

DNA can be protected from restriction enzymes by methylation. Methylation is the addition of a methyl group to a molecule, and in the case of DNA, the addition of a methyl group to a cytosine base can provide protection from restriction enzymes. Many bacteria have their DNA methylated as a form of self-defense against foreign DNA, such as that from phages or plasmids.

DNA Is Protected from Restriction Enzymes by Being