Mycorrhizae
a. increase plant growth.
b. are symbionts.
c. allow a plant to absorb more water.
d. increase the surface area for absorption of
water and minerals.
e. have all of these characteristics
E
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The two amino acids in the accompanying figure both have side groups (R groups) that are ____
a. acidic and polar b. uncharged and nonpolar c. basic and polar d. acidic and nonpolar e. uncharged and polar
A lesion in which brain center is most likely to lead to a coma or even death?
a. occipital cortex b. frontal cortex c. hypothalamus d. brain stem e. spinal cord
Antihistamines relieve allergy symptoms by
a. inhibiting the release of histamines and cytokines. b. binding directly to histamines. c. destroying mast cells before they can produce histamines. d. binding to the allergens. e. stimulating effector T cells to produce more cytokines
What is true about the lymphatic system?
A. It exhibits peristaltic contractions. B. It carries all absorbed materials from the stomach and intestines to the liver. C. It is bidirectional. D. Fluid moves through the lymphatic system under high pressure. E. It collects fluid that seeps into the tissues and returns it to the blood.