The plasma membrane is composed of a phospholipid bilayer and associated proteins. What else is commonly found in the plasma membranes of animal cells?
A) amino acids
B) ethanol
C) cholesterol
D) nucleic acids
Answer: C) cholesterol
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How does the production efficiency of ectotherms and endotherms compare?
A. Usually higher in ecotherms than in endotherms. B. Usually lower in ecotherms than in endotherms. C. Approximately equal in ectotherms and endotherms. D. Usually negative in ectothems and positive in endotherms. E. Usually positive in ectothems and negative in endotherms.
Which of the following is the primary fuel source for transportation?
a. nuclear energy b. renewable energy c. coal d. natural gas
e. petroleumGenerally, a pair of homologous chromosomes __________.
A) carry the same genes B) are the same length, shape C) interact at meiosis D) all of these choices
In 1891, August Weismann reported an experiment in which he cut the tails off 10 mice in each of 19 consecutive generations. The expected result is:
a. after the first generation of amputation, the progeny are born with no tails. b. offspring are born with progressively shorter tails in each generation. c. offspring are born with tails that are the same length as their parents for a few generations, but subsequent generations of offspring have shorter tails. d. all generations of offspring have tails of approximately the same length.