Based on the DNA strand here, what is the contemporary: 5’- ACTGACATG -‘3

If you're translating just DNA, then I think it would be TGACTGTAC. If I understood the question right you're just doing that translation thing where you swap the letter: A=T and C=G.

atp is used for energy.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products