Final answer:
The correct answer is d) AAGCTT.
Step-by-step explanation:
The correct answer is d) AAGCTT.
A restriction endonuclease is an enzyme that recognizes specific sequences of DNA and cuts the DNA at these sites. A 6-mer cutter specifically recognizes and cuts DNA at a site that contains a 6-nucleotide sequence. In this case, the sequence AAGCTT is the only one that matches these criteria, making it the most likely representation of a restriction endonuclease site for a 6-mer cutter.