Each enzyme produced by the body is specific—meaning it is only able to catalyze a reaction with a certain substrate. what causes an enzyme to be specific? the enzyme's surface folds are complementary to the substrate's surface folds. the enzyme has surface receptors that can recognize specific sequences of dna the enzyme is made out of the same type of molecule as its substrate. the enzyme is only produced an

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.

Compare the shapes of the bones of the human skull with the shapes of the bones of the human leg. how do the shapes differ? why are the shapes important?

Amoeba proteus is injected with a drug that inhibits the formation of microtubules. what effect does this have on the organism’s movement?