Regulated enzymes frequently exhibit a higher-order response to substrate concentration than non-regulated enzymes, which are commonly first-order. If enzyme "G" is first-order and enzyme "N" is fourth- order,
A. enzyme N will be more sensitive to changes in substrate concentration than enzyme G.
B. enzyme G is said to be cooperative.
C. a graph of velocity versus substrate concentration for enzyme G will have the shape of a parabola.
D. enzyme G will require energy from ATP to produce a product, but not enzyme N.