Question

Restriction endonucleases are especially useful if they generate "sticky" ends. What makes an end sticky? A. single-stranded complementary tails B. blunt ends C. poly-A sequences D. 5′ phosphate groups

Answer 1

The answer is A.

Step-by-step explanation:

The sticky end is an expression which is used for DNA strands that are cut by enzymes at the exact points that they complement each other through their bases. Cytosine corresponds the Guanine and Thymine corresponds to Adenine. When the DNA is cut at the correct spots, these corresponding matches stick together. So the answer to the question is given by the option A, single-stranded complementary tails because they are open ended with the bases mentioned before and can form bonds with their corresponding base.

I hope this answer helps.