The ancestors of modern ________ performed the oxygenic photosynthesis responsible for converting our anoxic planet to an oxygenated one.
A. Firmicutes
B. Proteobacteria
C. Cyanobacteria
D. Crenarchaeota
Answer: C
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Which of the following statements about nitrogenous waste excretion is correct?
A. Uric acid is less toxic than ammonia, but more energetically costly to produce. B. Ammonia is more toxic than urea, but requires less water for excretion. C. Urea is less toxic than uric acid, but more energetically costly to produce. D. Uric acid is less toxic than urea, but requires more water for excretion. E. Ammonia is less toxic than uric acid, but requires more water for excretion.
Alternative forms of genes are called
a. homologues. b. locus. c. loci. d. alleles.
Four of the five choices listed below are true for
gibberellin. Select the exception. a. breaks dormancy in buds b. first isolated from a fungus c. causes stem elongation d. triggers flower production e. overcomes genetic dwarfing
Competitive release is most likely to occur when a
A) species colonizes an island that already has potential competitors. B) species moves into new habitats that it never occupied on a mainland. C) species decreases in abundance. D) competing species is added to a community.