Heterotrophs must obtain organic molecules that have been synthesized by
A. autotrophs.
B. bacteria.
C. biogeochemical cycles.
D. decomposers.
Answer: A
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Mutations affect Hardy-Weinberg equilibrium by
A. allowing gene flow to increase. B. keeping allele frequencies unchanged between generations. C. decreasing the genetic variation that affects natural selection. D. altering frequencies of particular alleles within a population.
Each of the following is a voltage-gated Na+ channel property except
A) opens rapidly when stimulated. B) closes rapidly in absence of stimulus. C) opens to a variable extent depending on how much the stimulus voltage exceeds the threshold voltage. D) has a voltage sensor helix that controls channel gating. E) can be inactivated by the inactivating particle part of the channel protein.
Miller and Urey's experiments attempting to re-create the prebiotic environment produced a rich mixture of complex organic chemicals from simple chemicals
Indicate whether the statement is true or false
Which of the following members of the genus Bacillus is currently used as a biological insecticide?
A. B. anthracis B. B. thuringiensis C. B. subtilis D. B. cereus