2,4-D, a potent eudicot weed killer, is most likely a
synthetic
a. auxin.
b. gibberellin.
c. cytokinin.
d. phytochrome.
e. none of these.
Answer: a
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A collection of similarly specialized cells and any extracellular material they secrete and maintain describes
(a) an organ. (b) a system. (c) a tissue. (d) organelles.
The largest reservoir of water is
a. oceans. b. polar ice and glaciers. c. groundwater. d. lakes and rivers. e. atmosphere.
Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years, and when a patient becomes stressed, the virus is released, forming cold sores on the lips. Where will the virus be while dormant in the nerve cell?
a. Floating in the nerve cell cytoplasm b. Integrated in the nerve cell chromosomes c. In the nerve cell membrane d. Floating outside of the nerve cell, waiting to reinfect it e. In the blood
The axial skeleton contains bones that form the ____
a. skull, rib cage, and vertebral column b. chest and arms c. vertebral column and legs d. rib cage and legs e. shoulder and arms