Which one of the following is TRUE regarding enzymes?
A) Enzyme function is not affected by changes in temperature or pH.
B) Enzymes slow the rate of chemical reactions in living systems.
C) Enzymes are consumed in a chemical reaction, so an organism must constantly replace these enzymes.
D) Each enzyme catalyzes one specific reaction or group of reactions.
E) Enzymes convert products into reactants.
D
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A diagnostic test for M. tuberculosis exposure
A) utilizes an inflammatory reaction that occurs if there has been previous exposure to M. tuberculosis antigens. B) relies on previous tuberculin vaccination. C) uses an antiserum to detect antibodies in the blood that are only formed if there has been previous exposure to M. tuberculosis antigens. D) relies on an innate immune response that occurs only if there has been previous exposure to M. tuberculosis antigens.
Hirudinea is the only class of annelids that contains:
A. species that are parasitic blood suckers B. species with a segmented body C. parapodia D. a gizzard E. a clitellum
What process requires oxygen to function?
A. Aerobic respiration B. Anaerobic respiration C. Alcoholic fermentation D. Lactate fermentation E. Substrate-level phosphorylation
Nutrients absorbed by the intestines move directly to the liver, which
A) converts the nutrients into monomers. B) converts excess glucose to glycogen. C) manages the amount of glucose that is converted to amylase. D) converts glucose to alcohol.