Defining features of the halobacteria include
A. the production of methane.
B. absolute dependence on a high concentration of NaCl for growth.
C. absolute dependence on temperatures above 65ºC for growth.
D. absolute dependence on low pH conditions for growth.
Answer: B
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When comparing the sequences of a homologous gene in four different species, one pair of species shows a 1% difference, whereas the other pair shows a 3% difference. Which pair diverged longer ago from their common ancestor and why?
A. The pair with a 1% difference? a smaller difference (1% instead of 3%) indicates that there has been less time to accumulate mutations. B. The pair with a 1% difference? a smaller difference (1% instead of 3%) indicates that there has been more time to accumulate mutations. C. The pair with a 3% difference? A larger difference (3% instead of 1%) indicates that there has been less time to accumulate mutations. D. The pair with a 3% difference? a larger difference (3% instead of 1%) indicates that there has been more time to accumulate mutations.
A developer putting tract housing in a previously pristine area plans numerous small open space areas
where the original habitat is to remain. As a conservationist, how would you suggest changing the plan, if at all? (Canceling the development is not an option.)
What will be an ideal response?Which statement about taste receptors is NOT true?
A. Taste receptors are found only on the tongue in animals. B. Taste receptors generate nerve impulses in associated sensory nerve fibers. C. Taste receptors recognize sweet, sour, bitter, salty and umami sensations. D. Taste receptors are chemoreceptors. E. Taste receptors are located within taste buds in humans.
A protein's shape and chemical behavior are determined by ________
A) the cell's age B) the environment of an organism C) its linear sequence of amino acids D) the type of cell in which it resides E) the cholesterol makeup of the lipid membrane