Restriction Enzymes

question 18

Multiple Choice

Restriction enzymes:

• A) act at the membrane to restrict the passage of certain molecules into the cell.
• B) are highly specialized ribonucleases that degrade mRNA soon after its synthesis.
• C) are sequence-specific DNA endonucleases.
• D) are very specific proteases that cleave peptides at only certain sequences.
• E) catalyze the addition of a certain amino acid to a specific tRNA.

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