The CRISPR system
A) facilitates homologous recombination through a complex system of proteins and clustered repeats.
B) recognizes foreign DNA sequences that have previously entered the cell and directs the Cas proteins to destroy them.
C) repairs DNA and increases DNA damage tolerance during times of stress.
D) synthesizes gene transfer agents during stationary phase.

Question

Quizplus · Accepted Answer

The CRISPR system is a bacterial defense mechanism that recognizes foreign DNA sequences that have previously entered the cell and directs the Cas proteins to destroy them. This system allows bacteria to develop immunity to viruses and other invading genetic material.

Option A is incorrect as homologous recombination is a separate process that involves the exchange of genetic material between similar DNA molecules.

Option C is incorrect as the CRISPR system does not repair DNA, rather it provides immunity against foreign DNA.

Option D is incorrect as gene transfer agents are synthesized by bacteria during growth and division, not stationary phase.

The CRISPR System