Which of the Following Is Not True for the Nicotinamide

Multiple Choice

Which of the following is not true for the nicotinamide cofactors?

A) The oxidized form is positively charged.
B) The reduced form has a large extinction coefficient at 340 nm.
C) The oxidized form provides reducing equivalents to other molecules.
D) Oxidation-reduction reactions with nicotinamides usually involve hydride transfer.
E) Enzymes transfer hydrides stereospecifically to one or the other side of the nicotinamide ring.