In a population of grizzly bears, the largest adults are most likely to survive and reproduce, while the smallest adults lose most competitions for resources and produce fewer offspring. This is an example of ________ selection
a. stabilizing
b. directional
c. disruptive
d. sexual
b
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A molecule whose concentration determines the developmental fate of a cell is called
A) monomorphic. B) a maternal effect gene. C) a signaling molecule. D) a morphogen.
Portion of Figure 21.11
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Refer to the accompanying figure for questions 26-28.
The organism shown in the accompanying figure belongs to the ____ group.
A. kinetoplastids B. diplomonads C. green algae D. red algae E. brown algae
When cloning Dolly, in order to encourage the plasma membranes of the two cells to become leaky so that the contents of the mammary cell passed into the egg cell, researchers applied
A. several methyl groups. B. an electrical shock. C. adeno-associated viruses. D. DOPA.
Which of the following statements is a reason for NOT classifying viruses in one of three domains rather than in a fourth domain?
a. Viruses direct anabolic pathways of host cells. b. Viruses are obligate parasites. c. Some viruses can incorporate their genome into a host's genome. d. Viruses are not composed of cells. e. All of the answers are correct.