Proteins are involved in all of the following roles in the body, but do not:
a. act as regulators of fluid balance.
b. form antibodies.
c. form part of cholesterol's structure.
d. act as transporters.
e. participate in cell growth and repair.

i do not know the answer

Explanation:

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scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's

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