Biology · Principles and Processes in Biotechnology

What causes restriction enzymes to produce overhanging single-stranded stretches called 'sticky ends' on DNA strands?

1. A
   They cut both strands exactly at the center of the palindrome site, leaving blunt ends
2. B
   They cut the strand a little away from the centre of the palindrome sites between the same two bases on the opposite strands
3. C
   Exonucleases digest the entire length of DNA except the recognition sequence
4. D
   DNA ligase removes terminal phosphates to expose reactive hydroxyl groups