Streptomyces are aerobic soil bacteria that produce over two-thirds of our antibiotics. Why might a bacterium produce antibiotics?
A. to kill competing bacteria of the same species
B. to protect itself from a host immune system
C. to kill viruses that may try to infect it
D. to allow it to break down the cell walls of plants
E. to kill competing bacteria of different species
E. to kill competing bacteria of different species
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Connell conducted this experiment to learn more about _____
A) character displacement in the color of barnacles B) habitat preference in two different species of barnacles C) desiccation resistance and barnacle species D) how sea-level changes affect barnacle distribution E) competitive exclusion and distribution of barnacle species
Which of the following statements does not apply to aquaporins?
A. They are water transport channels. B. They occur in the plasma membrane. C. They are unique to plant cells. D. They do not alter the direction of water movement. E. They speed up osmosis.
How can the success of one group of organisms promote the adaptive radiation of a second group?
A) by providing new food resources, habitats, etc. for the second group to utilize B) by competing with the second group, promoting the second group's adaptive radiation C) by preying on the second group, which hastens the second group's adaptation D) by filling most of the available niches, which speeds up the second group's diversification
Winogradsky columns are useful in enriching for ________ microorganisms
a. aerobic b. anaerobic c. facultative anaerobic d. All of the above choices are correct.