Ligation reactions occur most efficiently between DNA fragments:
a. that have sticky ends.
b. that have blunt ends. that have complementary sticky ends.
c. that are cleaved with different restriction enzymes.
d. where one fragment has a sticky end and the other has a blunt end.

Explanation:

The sealing of nicks between two adjacent residues of a single-strand(ss) break on a double-strand DNA and the joining of double-strand breaks.

This is enzymatically catalyzed by the enzyme DNA ligase.

DNA ligation is the joining ends of 2 DNA molecules by the enzyme, DNA ligase. DNA ligase catalyzes the formation of two covalent phosphodiester bonds between the 3' hydroxyl group of one nucleotides and the 5' phosphate group of another and it is  an ATP dependent reaction.

DNA Ligation  occur most efficiently between those  DNA fragments  that have complementary sticky ends.

yes it is   dangerous

explanation:

because that foot is discusting and could get you sick

true                                                                                                       true true true true true true