Four of the five choices listed below are types of
selection exhibited by nature. Select the exception.
a. artificial
b. disruptive
c. stabilizing
d. directional
e. sexual
Answer: a
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A common consequence of nutrient deficiencies in plants is chlorosis, which is
a. wilting due to a lack of chlorine in leaves. b. death of the growing tips. c. premature loss of leaves. d. bursting of cells from excess water uptake due to an inability to clear chlorine from them. e. yellowing of plant tissues due to a lack of chlorophyll.
Which of the following statements about the fast block to polyspermy is FALSE?
a. It occurs within seconds after fertilization. b. It involves a wave of electrical depolarization that spreads over the egg surface. c. It is not mediated by Ca2+ ions. d. It is more pronounced in vertebrates than in invertebrates. e. It is more pronounced in invertebrates than in vertebrates.
The most reliable method of determining BAC is by ___ ___.
Fill in the blank(s) with the appropriate word(s).
There are fewer antifungal, antiprotozoan, and antihelminth drugs compared to antibacterial drugs because these organisms
A. do not cause many human infections. B. have fewer target sites compared to bacteria. C. are parasites found inside human cells. D. are not affected by antimicrobics. E. are so similar to human cells that selective drug toxicity is difficult to achieve.