Which Statements About Restriction Endonucleases Are True

question 31

Multiple Choice

Which statements about restriction endonucleases are true?
I. Each cleave DNA at the same site, but leave different fragment lengths.
II. Each recognizes 4 to 8 nucleotides, and cleaves at all sites containing the sequence.
III. Approximately 1000 restriction endonucleases have been isolated and characterized.
IV. Each cleaves the DNA strand by reducing the base off at the sugar 1' position.

• A) I, IV
• B) II, IV
• C) II, III
• D) III, IV

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