Nitrogen-fixing bacteria convert N2 into
A. nitrates.
B. ammonium ions.
C. nitrites.
D. carbon dioxide.
E. methane.
Answer: B. ammonium ions.
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Allele frequency can be measured using what technique?
A. observation of phenotype B. gel electrophoresis C. DNA sequencing D. All of the answer options are correct. E. None of the answer options is correct.
Latency in HIV occurs when
A. the virus switches back to an active form. B. new viral particles are made. C. the viral genome forms an episome and remains dormant. D. the virus integrates into the host genome and remains dormant
Which of the above plants belongs to the same genus
as Rosa canina? a. apple b. artic rose c. carrot d. marijuana e. all of these
Over a span of several thousand years, a number of species show adaptations to climate change: Drier, warmer conditions select for succulent vegetation and deep taproots in plants, burrowing in mammals and amphibians, and other similar adaptive changes
What could be predicted to happen if the climate shifts in the opposite direction and becomes progressively wetter and cooler? A) Ongoing processes of adaptation will continue because evolution is goal directed. B) Different adaptive trends will probably be favored in the new climatic environment. C) Current adaptive trends will continue, but organisms will now also have to add on adaptations to deal with cool, wet conditions. D) Adaptation will cease because cool, wet conditions are suitable for all life on Earth.