In the reaction cycle involved in the oxidation of pyruvate, what are the advantages of having three enzyme activities contained in a single large complex instead of having three smaller and physically independent enzymes?
What will be an ideal response?
By co-localizing three enzyme activities in a large, layered complex, the substrates are already bound and properly positioned for rapid enzyme catalysis, and the free energy released by one reaction can be readily harnessed for the next.
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Consider this pathway: epinephrine ? G protein-coupled receptor ? G protein ? adenylyl cyclase ? cAMP. The second messenger in this pathway is _____
A) cAMP B) G protein C) GTP D) adenylyl cyclase E) G protein-coupled receptor
Which are members of the family Hominidae? Check all that apply.
_____ orangutans _____ humans _____ gorillas _____ chimpanzees _____ monkeys
Both pocket mice and peppered moths are exposed to selection pressure caused by ________
a. industrial pollution b. predators c. temperature changes in their habitats d. vegetative disruptions caused by introduced plant species
Which of the following is NOT secreted by the
intestinal mucosa? a. secretin b. cholecystokinin c. gastrin d. GIP e. aminopeptidase