The childhood disease that damages the body defenses and is frequently complicated by secondary infections involving, primarily, Gram-positive cocci is
A. German measles.
B. measles.
C. mumps.
D. chickenpox.
B.
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Tannins are chemicals that help plants repel invaders by
A. over-stimulating the predator. B. sedating the predator. C. binding to proteins and thereby disrupting the predator's digestion. D. injuring the external covering of the predator's body. E. causing the predator to grow so rapidly that it dies.
Hominids evolved when the climate was
a. wet and hotter. b. wet and cooler. c. dry and hotter. d. dry and cooler. e. none of these
What is being described? Contains the nitrogenous base thymine
What will be an ideal response?
Each antibody molecule consists of
A) two light and two heavy protein chains. B) one light and one heavy protein chain. C) a "heavy" protein chain. D) a "light" protein chain. E) various combinations of light and heavy protein chains.