In the summer, temperatures in the native range for black widowbirds are exceedingly hot. To
cool themselves, the birds undergo a type of panting known as gular fluttering. This leads to
evaporative water loss that cools the birds. This cooling is essential for __________.
a. meiosis
b. adaptive radiation
c. homeostasis
d. heterotrophy
C
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The relationship of disease-causing organisms to an infected rabbit is one of
A. parasitism. B. commensalism. C. competition. D. herbivory. E. interference competition.
Evidence from Stanley Miller's experiments and evidence from carbonaceous chondrites collected from meteorites, taken together, most directly support the contention that
a. life can arise under conditions of extreme heat or cold. b. organic molecules can be synthesized by natural chemical processes. c. life did not arise on earth, but rather arrived from another planet by meteorite. d. living organisms are required to produce complex organic compounds. e. organic compounds require gravity for their formation.
Which of the following statements is false?
a. Enzymes catalyze reversible reactions in either direction. b. Enzymes are highly specific. c. Most enzymes are protein molecules. d. Enzymes allow some reactions to occur that would never occur without them. e. Enzymes may be temporarily modified during their involvement with the substrate.
The fossil record is incomplete because
a. very few organisms were preserved as fossils. b. organisms tend to decay before becoming a fossil. c. animals with hard parts are preserved more easily. d. geologic processes may destroy fossils. e. all of these are true.