The Cas9 Enzyme Used in the CRISPR System

question 58

Multiple Choice

The Cas9 enzyme used in the CRISPR system

• A)was created by scientists by modifying restriction enzymes.
• B)was discovered in bacteria as part of a mechanism to protect themselves from foreign DNA.
• C)was found as part of a natural mechanism used by plants to protect themselves from viruses.
• D)was found in cultured mouse embryonic stem (ES) cells.

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