During moderate but prolonged exercise, most of the
energy for contraction is supplied by
a. creatine phosphate.
b. aerobic respiration.
c. anaerobic respiration.
d. fermentation.
e. glycolysis.
Answer: b
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Which of the molecules is polar and acts like a base?
A. R-NH2 B. R-CO-R C. R-OH D. R-PO4 E. R-SH
In competitive inhibition
a. the products of the reaction block the active site of the enzyme. b. the products of the reaction bind to a site other than the active site of the enzyme and block enzyme activity indirectly. c. the substrate and cofactors compete for the active site. d. the inhibitor binds to and directly blocks the active site of the enzyme. e. the inhibitor binds to an enzyme at a site other than its active site.
A problem with the basic Oparin-Haldane model for the origin of life (though not necessarily an unsolvable one) is that ________
A) it does not explain the origin of chirality B) the early Earth is now not thought to have had a highly reducing atmosphere C) monomers have to be chemically activated before they will polymerize D) purine bases can attach to sugars in many equally probable ways E) All of the above.
Most of the oligotrophic proteobacteria are found in the ________.
A. alpha proteobacteria B. delta proteobacteria C. beta proteobacteria D. gamma proteobacteria