The multicelled projections that protrude from the lining of the small intestine are called ____
a. sphincters
b. brush borders
c. microvilli
d. villi
e. macrovilli
ANSWER: d
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The tails of some bacteriophage
A. exhibit oar-like motion that drives the phage genome into the cytoplasm of the host. B. include a tail sheath that shortens. C. rotate like flagella to drive the phage genome into the cytoplasm of the host. D. None of the choices are correct.
When a student manipulates a system under study, he or she is collecting:
a. empirical data. b. experimental data. c. observational data. d. data. e. facts.
Based upon shared features, which two species have the closest evolutionary relationship?
a. Mice and humans b. Lizard and humans c. Mice and worms d. Lizards and worms e. Fish and humans
What structures cushion the embryo during development and allow it to be provided with nourishment and exchange wastes?