A piece of carbon has a mass of 9 g and a valine of 4 cm 3

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.

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