B) separates sections of DNA by size in order to isolate specific genes. (1 point)

eukarya because is is like alche and b is bacteria and d is animals

explanation:

the answer is b.) hydrogen bonds between bases.

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