15N-labeled DNA from bacteriophage T2 is mixed in equal proportions with T2 DNA of normal density and then heated together and slowly cooled. The resulting DNA is analyzed by centrifiguation in a CsCl density gradient of the type used by Meselson and Stahl. How many bands will be observed and what will their relative proportions be

b.have there own function.

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.