If the bacterium Staphylococcus aureus experiences a cost for maintaining one or more antibiotic-resistance genes, then what should happen in environments from which antibiotics are missing?
A. These genes should continue to be maintained in case the antibiotics ever appear.
B. These bacteria should be outcompeted and replaced by bacteria that have lost these genes.
C. The bacteria should start making and secreting their own antibiotics.
D. The bacteria should try to make the cost worthwhile by locating, and migrating to, microenvironments where traces of antibiotics are present.
B. These bacteria should be outcompeted and replaced by bacteria that have lost these genes.
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Archaeal cell walls
A. are disrupted by treatment with lysozyme or penicillin. B. include orthomureine. C. are similar to those of Gram-negative bacteria. D. lack murein and D-amino acids.
People do not develop a secondary immune response to influenza because
A) the immune system mutates from season to season. B) secondary immune responses are only possible against bacteria. C) the primary immune response is sufficient to protect against flu. D) the causative viruses mutate each season.
The structures that will exchange nutrients and
wastes with maternal blood are indicated by a. A. b. B. c. C. d. D. e. E.
The biome with the greatest amount of topsoil and
the richest, most fertile soil is the a. tundra. b. taiga. c. tropical rain forest. d. desert. e. grassland.