試題詳解

16. Which of the following statements correctly identifies a type II restriction endonuclease?
(A) They work on both DNA and RNA.
(B) They recognize a palindromic sequence and cut just before the palindromic sequence.
(C) The result of this endonuclease is blunt ends.
(D) They degrade DNA by subsequently removing bases from each end.
(E) They cut DNA only at sites in specific nucleotide sequences with a two-fold axis of symmetry.