Why Do Metabolic Pathways Require Tens to Hundreds of Different

Multiple Choice

Why do metabolic pathways require tens to hundreds of different enzymes?

A) The enzymes are used up after one reaction and the molecules have to undergo multiple rearrangements.
B) The enzyme is deformed by the interaction with the substrate and needs a period of time to return to its original reactive form, so many enzymes are needed to keep the pathway going.
C) Each enzyme has a specific substrate and produces a specific product.
D) Multiple enzymes are not required for the pathway, but having them speed up the production of the final product.
E) The enzymes are attached to a membrane and cannot move to the location of the new intermediate, so having a long line of enzymes to carry out the reaction allows the reaction to occur faster.