The hypothesis of punctuated equilibrium was proposed by Eldredge and Gould to explain the apparent long-term genetic stability of
a. many species occupying the same niche in an ecosystem
b. organisms that encounter many environmental changes
c. climax communities resulting from ecological succession
d. some species as evidenced by the fossil record
e. certain alleles common to a wide variety of organisms
Answer: d. some species as evidenced by the fossil record
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Which of the following genera include bacteria with stalks?
A. Campylobacter B. Vibrio C. Rhizobium D. Caulobacter
Which of the following are types of symbioses? Check all that apply.
_____ Batesian mimicry _____ commensalism _____ predation _____ parasitism _____ mutualism _____ Müllerian mimicry
How are hormone levels regulated?
A. An endocrine gland can respond to the blood level of the hormone it produces. B. A product can trigger hormone production; the hormone can then reduce the amount of product which in turn reduces the level of hormone. C. A hormone can trigger a second gland to secrete a hormone that dampens production of the first hormone. D. A second contrary hormone can counteract the effect of the first hormone. E. All of the choices are correct.
Photorespiration
A) produces glucose. B) is an evolutionary relic from when atmospheric O2 levels were low and did not interfere with rubisco. C) is of benefit to the plant since it breaks down rubisco. D) is attributable to high CO2 levels. E) produces ATP.