What effect would adding additional substrate, in the presence of a noncompetitive inhibitor, have on the enzymatic reaction?

no effect will occur.

Explanation:

non-competitive enzyme do conformational changes in active site of enzyme by attaching to the other side rather than active side which prevent the substrate to attach to the active site, in results it stops the enzyme to work while competitive inhibitors compete with substrate for active site so increase substrate in competitive inhibitor condition can overcome the its effect.

answer; the above answer to the above statement is (true)