The agent of microevolutionary change that is most likely to introduce genetic variation from another population is
referred to as ____.
a. genetic drift
b. gene flow
c. natural selection
d. mutation
e. nonrandom mating
ANSWER: b
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The peptidoglycan of bacterial cell walls contains a carbohydrate matrix linked together by short chains of:
A. fatty acids. B. steroids. C. nucleotides. D. amino acids. E. water molecules.
Fluid waves within the cochlea cause the movement of the:
A. tympanic membrane. B. basilar membrane. C. tectorial membrane. D. basilar membrane and tectorial membrane.
Yeast produce ethanol, a toxic waste product during fermentation. Why would yeast undergo fermentation instead of cellular respiration?
A. to regenerate NAD+ in order to continue glycolysis B. to use up excess pyruvate in order to continue glycolysis C. to avoid the production of lactic acid D. to produce NADH for energy E. to conserve oxygen for other reactions
Methane is produced in manure piles and many other
environments. Which of the following statements is TRUE concerning this alternative fuel? a. High concentrations are collected from pig farms annually. b. It is found in large geological deposits. c. It does not burn with enough energy to be useful. d. It needs an effective collection technique. e. All of these are true.