-All polymerases have a 3′ to 5′ exonuclease activity for error correction.

1.  True
2.  False

-The stacking of bases in double helices is similar to the interactions observed when the amino acid side chains involved in recognition are:

1.  Leu and Ala.
2.  Lys and Arg.
3.  Asn and Gln.
4.  Phe and Tyr.
5.  Cys and Met.