Algin is a substance used to thicken products as diverse as ice cream, cosmetics, and floor polish. It is extracted from
the cell walls of ____ algae.
a. green
b. golden
c. blue-green
d. brown
e. red
ANSWER: d
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Natural selection results in organisms perfectly adapted to their environments
a. True b. False
Which of the following mammalian lineages contains organisms that lay eggs?
a. Strepsirhini b. monotremes c. Rodentia d. Haplorhini e. marsupials
The first complete plant genome to be sequenced was that of
a. Phaseolus vulgaris (kidney bean). b. Arabidopsis thaliana (thale cress). c. Zea mays (corn). d. Capsella burse-pastoris (shepherd's purse). e. Oryza sativa (rice).
Consider a pond on your college campus. All of the organisms that live in the pond, including bacteria, protozoa, algae, plants and animals, represent a/an
A. population. B. niche. C. community. D. habitat. E. ecosystem.