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

question 7

Multiple Choice

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

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