According to Fig 9.10, which of the following is NOT responsible for amplifying the signal in a cell responding to adrenaline signaling?
A. the binding of the receptor by adrenaline
B. the production of cAMP by adenylyl
cyclase
C. the activation of protein kinase A by cAMP
D. the phosphorylation of proteins by protein
kinase A
E. All of these choices amplify the adrenaline
signal.
E
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In the identification of mycobacterial isolates, the Tween 80 test involves:
a. an enzyme that is able to produce Tween 80 from certain ingredients found in the medium. b. a lipase that is able to hydrolyze polyox-yethylene sorbitan monooleate into oleic acid and polyoxyethylated sorbitol. c. the metabolism of niacin to nicotinic acid by enzymatic action. d. testing the isolate for susceptibility to Tween 80.
Which of the following is the term for the chemical reactant to which an enzyme binds?
a. Catalyst b. Substrate c. Active site d. Lock-and-key
Generation time increasing with body size is least likely in _______
a. bacteria b. plants c. animals d. protists e. fungi
The boreal forests of North America are dominated
by a. spruce, fir, and pine. b. redwoods and sequoia. c. birch and aspen. d. long-leaf and loblolly pines. e. cedars and junipers.