I will give 20 points so pls help

A) The active site of enzyme would not bind perfectly to this reactant molecule, it would be a sub optimal binding of enzyme molecule to reactant. However, since active site of the enzyme would be occupied, it would not be able to bind to correct substrate and do its function. Therefore, enzyme reaction would sub-optimal/slow or completely negative depending on the specificity of active site and its binding to the reactant molecule.

Mg is used to measure mass