A molecule is
a. a combination of two or more atoms.
b. a mixture of atoms.
c. electrically charged.
d. a carrier of one or more extra neutrons.
e. none of these.
Answer: a
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The cardiac, pyloric, anal, and ileocecal sphincters are all part of the
(a) digestive tract. (b) respiratory tract. (c) circulatory system. (d) muscular system.
All of the following are adaptations associated with flight that are first seen in Archaeopteryx
EXCEPT
a. feathers. b. a wishbone. c. backward facing claws for perching. d. a toothed beak.
Mutation as a force in genetic diversity serves to
A. increase genetic diversity. B. rapidly change allele frequencies. C. maintain a genetic equilibrium. D. work against selection. E. do none of these.
Details of small internal cell structures are best visualized with a
A. Transmission electron microscope B. Bright-field microscope C. Dark-field microscope D. Scanning electron microscope E. Fluorescent Microscope