Enzyme molecules normally interact with substrate molecules. some medicines work by blocking enzyme activity in pathogens. these medicines are effective because: a. they are the same size as the enzymeb. they are the same size as the substrate moleculesc. have a shape that fits in the enzymed. have a shape that fits into all cell receptors

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.