Male guppies are known for their bright colors. Having bright colors attracts mates, but it also attracts predators. So in an environment with a lot of predators, male guppies have more dull colors. In an experiment, guppies were removed from an area
with predators to an area without predators. Over a period of 12 months the population became much more colorful. This is an example of a response to:
A) disruptive selection. B) mutation.
C) directional selection. D) stabilizing selection.
Answer: C
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The feeding chambers inside the sponge are lined with specialized cells that generate a directed water current through the sponge and trap and ingest microscopic food particles. What are these cells called?
a. amoebocytes b. sclerocytes c. choanocytes d. pinacocytes
Histamines
a. are produced by phagocytes to cause mucous production. b. are produced by mast cells to cause prostaglandin production. c. are produced by complement to attract phagocytes. d. are produced by mast cells to cause capillary dilation. e. are produced by complement to cause capillary constriction.
Which of the following is true of movement
through the phloem?
a. movement through phloem is through live cells b. movement between sieve tube members is via plasmodesmata c. movement through the phloem is not necessarily up d. the phloem cells through which movement occurs are non-nuclear e. all of these are true about movement through the phloem
Members of a biological species CANNOT successfully interbreed with members of other species.
a. true b. false