The bolus of food moves down the esophagus by a motility process called

1. dermis

2. chemical

3. urine

4. viruses

5. antibodies

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

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.

i believe it would be c: tons.