Which of the following is NOT characteristic
of parasites?
a. They are specialists and usually are able to
affect only one variety of hosts.
b. They inflict serious injury and kill their
hosts.
c. Some reside inside their hosts, whereas
others live outside their hosts.
d. Their host may be a plant as well as an
animal.
e. They are dependent on hosts.
B
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As a seed germinates, its shoot points upward toward light, and its roots grow downward into the soil. Turn the plant sideways, and the stem and roots bend according to the new direction of gravity. How do roots and shoots grow in opposite directions as the plant is rotated?
A. The absorption of light by phytochromes only occurs in shoots. B. The roots and shoots respond oppositely to auxin. C. The circadian rhythms of roots and shoots are opposite. D. Statoliths move in the opposite direction of roots and shoots. E. through differences in thigmotropism
All zygotes are
a. multicellular. b. diploid. c. animals. d. clones. e. gametes.
The endosymbiotic theory is concerned with the development of
A. prokaryotic cells. B. eukaryotic cells. C. coacervates. D. prebionts.
Which of the following is the best definition of a virion?
a. An infective virus inside of a host b. An infective virus outside of a host c. An inert virus inside of a host d. An inert virus outside of a host e. A virus which has infected a bacteria