The Clustered,regularly Interspaced Short Palindromic Repeats (CRISPR)system in Bacterial Cells

question 75

Multiple Choice

The clustered,regularly interspaced short palindromic repeats (CRISPR) system in bacterial cells has been called the "immune" system of bacteria.CRISPR protect bacteria from a repeat infection from the same phage because bacterial cells

• A)recognize proteins on the surface of the phage and secrete enzymes that digest the phage.
• B)recognize proteins on the surface of the phage and secrete proteins that block the binding of the phage.
• C)integrate fragments from the phage DNA in their own chromosomes and target for destruction any DNA that contains the same fragments in the future.
• D)modify the attachment sites for the phages so that new infections cannot take place.

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