Astrobiology seeks to answer all of the following
questions EXCEPT
a. What is necessary for life to persist..
b. Is there life on other planets.
c. What conditions allowed life to form on earth.
d. Can we colonize other planets with life from
earth.
e. All of these are true.
Answer: d
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Anoxygenic photosynthetic bacteria
A. obtain electrons from water. B. do not produce oxygen as a by-product. C. may obtain electrons from H2S. D. are obligate aerobes. E. do not produce oxygen as a by-product AND may obtain electrons from H2S.
Carbon is rarely deficient in plants
a. True b. False
Hydrophobic hormones act by ____
a. triggering a genomic response b. triggering a signal transduction pathway c. activating an effector molecule d. inhibiting feedback loops e. preventing translation
Zero population growth is achieved
a. when a population reaches the carrying capacity of the environment. b. when emigration and immigration are balanced, and the number of births equals the number of deaths. c. anytime that births exceed deaths. d. anytime that deaths exceed births. e. when emigration and immigration are prevented.