When cells express different genes, what occurs?
a. cell reproduction
b. morphogenesis
c. cell differentiation
d. apoptosis
question 2
differentiated cells will first organize themselves into
a. tissues
b. organs
c. organ systems
d. a new organism
question 3
a newly fertilized cell of c. elegans is referred to as
a. zygote
b. larva
c. egg
d. adult
question 4
the red blood cell count is kept stable despite production of new cells by what?
a. blood loss
b. cell division
c. programmed cell death
d. cell differentiation
question 5
some cells will undergo programmed death when
a. healthy
b. diseased
c. dividing
d. differentiating

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.