Virulence determinants (factors) of Helicobacter pylori include which of the following?
A. Motility.
B. Urease enzyme.
C. Adhesins
D. All of the above are correct.
Answer: D. All of the above are correct.
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Do you agree with geneticists that there is no genetic basis to divide humans into races? Why or why not?
What will be an ideal response?
In the Gulf of Mexico, red tides caused by the dinoflagellate Karenia brevis cause massive fish kills as well as respiratory problems in humans. As an environmental scientist, what would you suggest concerned citizens do to help prevent these red tides?
A. Purchase fuel-efficient vehicles B. Decrease the amount of artificial light in coastal areas C. Encourage sustainable fishing D. Reduce fertilizer use on lawns and gardens E. Participate in beach cleanup efforts
What type of population growth effect is a flood that washes away many rabbits of population?
a. a density-dependent factor b. a limiting factor dependent on the individuals c. a consequence of exponential growth d. a density-independent factor e. an initial carrying capacity
The fiddlehead is a ________ that unfolds into a ________.
A. diploid sporophyte; fern frond B. haploid gametophyte; fern frond C. diploid gametophyte; fern frond D. diploid gametophyte; moss plant E. haploid sporophyte; fern frond