Which kind of T cell is most important in the removal of cancer cells or virally infected cells from the body?
A. memory T cells
B. helper T cells
C. cytotoxic T cells
D. suppressor T cells
Answer: C
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A rightward shift in the oxygen dissociation curve means that:
A. the affinity of hemoglobin for O2 has decreased. B. the hemoglobin protein has denatured. C. the pH of the blood has increased. D. the CO2 levels in the blood have decreased. E. less O2 is released by hemoglobin to the body cells.
A microbial ________ is a collection of strains that share many stable properties and differ significantly from other groups of strains.
Fill in the blank(s) with the appropriate word(s).
The genetic diversity within a species of a
given region is called the
a. biodiversity. b. dominance hierarchy. c. biogeographic distribution. d. biome. e. community
Water molecules readily form hydrogen bonds with other polar molecules, and when they encounter nonpolar molecules they must form hydrogen-bonding networks with neighboring water molecules
Which of the following molecules will cause a "cage" of water to form? (a) 2-methylpropane (b) acetone (c) methanol (d) urea