Stem cells are cells that do not have a specific function. What must happen to these cells for them to become specialized cells like heart muscle cells? The cells must begin to divide by mitosis
The nucleus in the stem cell must become bigger and more DNA has to be produced
o Cells must begin to mutate its DNA
Certain genes in the cell have to become activated to cause special enzymes to form

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.

if you listed your answers right then i believe your answer is b.