The CRISPR-Cas system helps some prokaryotes defend against infection by viruses. Which of the following statements correctly describes how this system works?
A) it produces RNA that is translated into proteins that attack viral DNA
B) it inserts specific genes into the prokaryotic genome
C) it causes proteins to synthesize proteins that are then secreted by the prokaryote and attack viruses
D) it cuts DNA at specific sequences to which it is directed

Question

Quizplus · Accepted Answer

The CRISPR-Cas system functions by using RNA molecules, which guide the Cas enzymes to cut DNA at specific sequences, allowing the system to target and cleave viral DNA, thereby defending the prokaryote from viral infection.

The CRISPR-Cas System Helps Some Prokaryotes Defend Against Infection by Viruses