The CRISPR Mechanism Helps Bacterial Cells Defend Themselves Against Foreign

question 23

Multiple Choice

The CRISPR mechanism helps bacterial cells defend themselves against foreign DNA. Put the following CRISPR events in order, from first to last.
-4

• A) Foreign DNA enters cell for first time
• B) Protospacers are generated by Cas
• C) Foreign DNA is incorporated into CRISPR array
• D) CRISPR sequence is transcribed
• E) CRISPR RNA is fragmented
• F) sRNA targets foreign DNA for destruction

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