CRISPR is Considered an Example of Adaptive Immunity in Bacteria

Question

CRISPR is considered an example of adaptive immunity in bacteria and archaea because it
A) methylates host DNA and destroys invading DNA.
B) requires host "pac" sites in order to destroy invading DNA.
C) minimizes damage from foreign DNA by using guide RNA similar to the invader and cas proteins to cleave the foreign DNA.
D) prevents the production of cell surface receptors that allow phages to get into the cell.
E) prevents archaeal DNA from infecting bacteria.

Accepted Answer

CRISPR employs guide RNA that is similar to the invader's DNA to minimize damage from foreign DNA. Cas proteins are used to cleave the foreign DNA, which provides adaptive immunity against foreign invaders.