The usual type of symbiotic relationship between humans and the bacteria normally found in their intestinal tract is that of
A. predator/prey.
B. parasitism.
C. mutualism.
D. communism.
C. mutualism.
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To Edward Forbes is attributed the idea that:
a. life could not survive in the deep ocean. b. life occurs throughout the ocean depths. c. continents drift upon the earth's mantle. d. the mid-Atlantic rift ridge is a result of continental drift. e. "dead zones" occur in oxygen-depleted coastal waters.
Why are small populations more affected by genetic drift than larger ones?
What will be an ideal response?
In eukaryotes, what is the difference between promoter proximal elements in "housekeeping genes" vs. cell-specific genes, and how does this relate to gene expression?
What will be an ideal response?
Pathogens may be attenuated for use in vaccines by
A. raising the pathogen for several generations in tissue culture cells. B. genetic manipulation. C. treatment with formaldehyde. D. genetic manipulation coupled with treatment with formaldehyde. E. genetic manipulation and/or raising the pathogen for several generations in tissue culture cells.