Polymerase is the the enzyme responsible for the "re-zipping" or completing of the DNA strands.
Amylase, found predominantly in saliva.
salivary amylase (salivary glads) and pancreatic amylase (pancreas)
It would have to be RNA Polmerase -JV
Yes, enzymes are responsible to break down complex molecules to simpler one for digestion
ATPase...when activated it phosphorylates ADP
An example for this is, cytidine deaminases (AID and APOBEC proteins), they can convert C in to U, there by make G--A mutation in double stranded DNA.
DNase I: deoxyribonuclease