Restriction endonuclease cuts at
(A) AAGGAA (B) AAGAAG (C) AAGTTC (D) AAGCTT
(D) Answer-D. AAGCTT* AAGCTT is the only palindrome among the choices. Because the sequence of only one DNA strand is given, one must determine the base sequence of the complementary strand. To be a palindrome, both strands must have the* The vast majority of restriction endonucleases recognize palindromes, andsame sequence when read in the 5'-3' direction. Thus, the complement of 5'-AAGCTT-3' is also 5'-AAGCTT-3'.