After a copper smelter begins operation, local downwind populations of plants begin to adapt to the resulting air pollution. Scientists document, for example, that the acid tolerance of several plant species has increased significantly in the polluted
area. This is an example of
A) stabilizing selection.
B) disruptive selection.
C) directional selection.
D) genetic drift.
Answer: C
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Why is more than one sperm needed for fertilization to occur, when only one sperm actually penetrates the egg?
a. the sperm work together to lower the acidity in the uterus for survival b. the sperm work together reduce drag as they swim up the oviduct c. the sperm work together to surround the egg prior to fertilization d. the sperm work together to break down the egg's protein layer e. the sperm work together to break down the cap on the sperm's head
What cells do not divide regularly but can be stimulated to divide when necessary?
a. Nondividing b. Mast c. Mitotic d. Facultative mitotic
Light microscopes
A) typically provide more resolution than an electron microscope. B) work by reflecting electrons off the surface of an object being studied. C) use light and glass lenses to magnify an image. D) are generally not used to view bacteria.
Janice has just had hip replacement surgery and her physician has prescribed antibiotics and directed her to take them every time she has a dental appointment. This is an example of antibiotic
A. abuse. B. synergy. C. allergy. D. prophylaxis.