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.

Biology & Microbiology

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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

Biology & Microbiology

Which are members of the family Hominidae? Check all that apply.

_____ orangutans _____ humans _____ gorillas _____ chimpanzees _____ monkeys

Biology & Microbiology

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

Biology & Microbiology

Which of the following is NOT secreted by the

intestinal mucosa? a. secretin b. cholecystokinin c. gastrin d. GIP e. aminopeptidase

Biology & Microbiology