Suppose you develop an in vitro assay to accurately measure the activity of purified TrbL protein. If you carry out site-directed mutagenesis on your cloned wookiee trbL gene, you can express mutant alleles of trbL in E. coli and purify mutant TrbL protein for study. You create two different mutant alleles of trbL: one of these mutations codes for an Ala!Glu change at residue 100 (A100E) and another codes for a Leu!His change at reside 113 (L113H). You purify the two mutant proteins and use them in your TrbL assay. The A100E mutation does not change TrbL activity but the L113H mutation results in a loss of TrbL activity. What can you conclude about the roles of the Ala-100 and Leu- 113 residues in TrbL activity?

true, i don't really know what you're asking but from the info you provided im guessing the answer is true.

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.