This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Restriction endonuclease cuts at 
Select and explain. 
A. AAGGAA, B. AAGAAG, C. AAGTTC, D. AAGCTT
D: AAGCTT
Answer: D: AAGCTT 
Explanation: 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'.