Multiple choice

Which of the following explanations about restriction endonucleases is FALSE?

  1. The enzymes are natural products of bacteria.

  2. The enzymes cut DNA at defined sequences.

  3. The enzymes cut only single-stranded DNA molecules.

  4. The enzymes are named because they restrict the growth of bacteriophage.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Restriction endonucleases cut double stranded DNA and are made by bacteria, where they cut DNA injected into the cells by bacteriophage.

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