Members of the genus Mycoplasma are pleomorphic and stain Gram-negative because they
A. lack cell walls.
B. have sterols in their cytoplasmic membranes.
C. lack cytoplasmic membranes.
D. have mycolic acid in their cell walls.
E. have a rudimentary cell wall.
Answer: A
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In this food web, the sunflower is __________
a. the primary producer b. the primary consumer c. the autotroph d. both the primary producer and autotroph
Currently, the International Union for Conservation of Nature and Natural Resources (IUCN) does not monitor threats to:
a. vertebrates b. plants c. invertebrates d. mammals e. bacteria
The observation that different geographical areas sometimes exhibit plant and animal communities of similar appearance, even though the individual plants and animals are not closely related, is called
A. the fossil record. B. divergent evolution. C. adaptation. D. convergent evolution. E. homology.
Over generations in a population, traits seen in individuals with higher fitness values will
A. decrease the population's mean fitness. B. stay at the same frequency in the population. C. become less prevalent in the population. D. become more prevalent in the population.