Four of the five answers listed below are probable components of the Earth's primitive atmosphere
Select the exception.
a. hydrogen gas
b. oxygen gas
c. nitrogen gas
d. carbon monoxide gas
e. carbon dioxide gas
B
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The process by which water is "pulled" up through the xylem columns of plants as it evaporates out of the leaves is called
A. respiration. B. transpiration. C. osmosis. D. anhydration. E. stomatization.
. "Complement" refers to a set of specific
a. vaccines. b. defense proteins. c. antibodies. d. antibiotics. e. lymphocytes.
Which of the following statements about the plant epidermis is false?
a. The epidermis is a single layer of cells. b. The epidermis of the shoot system prevents water loss by a cuticle. c. The epidermis of the root system allows the intake of water. d. The epidermis of woody stems is replaced by the periderm. e. The epidermis is the primary photosynthetic part of the shoot system.
Which of the following is NOT true of spindles?
a. They are permanent cell structures. b. Centrosomes act as microtubule originating centers for spindles. c. Some of their microtubules overlap at the cell equator. d. Tubulin is the main component. e. They are bipolar in their configuration