____ does not contribute to genetic variety.
A. Independent assortment
B. Cytokinesis
C. Sexual reproduction
D. Crossing-over
B. Cytokinesis
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Which is the correct order of organization in nature, from least inclusive to most inclusive?
a. ecosystem ? community ? population ? organism b. organism ? community ? population ? ecosystem c. organism ? population ? community ? ecosystem d. population ? organism ? ecosystem ? community e. community ? organism ? population ? ecosystem
The periodic table of the elements was devised by
a. Henri Becquerel. b. Demitri Mendeleev. c. Melvin Calvin. d. Marie Curie. e. Becquerel and Mendeleev.
Human skin color likely represents a locally adapted compromise between
A) the need to block UV radiation that causes cancer and the need to absorb sunlight for heat. B) the need to block UV radiation that destroys folate and the need to synthesize vitamin D. C) the need to block UV radiation that destroys folate and the need to absorb sunlight for heat. D) the need to blend in with the environment and the need to absorb sunlight for heat.
The bacterium Neisseria gonorrhoeae causes the sexually-transmitted infection gonorrhea. Although it can be isolated from the vagina, there are numerous normal biota in that location as well. To generate a pure culture of this pathogenic bacterium, the best choice is a(n) ________.
A. selective medium B. enrichment medium C. differential medium D. liquid medium