Question

restriction enzymes are
multiple choice
exonucleases.
endonucleases.
proteases.
lipases.

Explanation:

Restriction enzymes cut DNA at specific internal sites. Endonucleases act on the interior of nucleic - acid molecules, while exonucleases act on the ends. Proteases act on proteins and lipases act on lipids. So restriction enzymes are endonucleases.

Answer:

B. endonucleases