A trait caused by an environmental influence that appears to be inherited is
A) pleiotropic.
B) a phenocopy.
C) incompletely penetrant.
D) multigenic.
B) a phenocopy.
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When an enveloped virus adsorbs to the host cell with its protein spikes, the virions are taken into the cell by the process of
A. penetration. B. production. C. fusion. D. endocytosis.
Today's atmosphere on Earth is made up of nitrogen, oxygen, carbon dioxide, and water. According to all models, which of these was largely absent 3.8 billion years ago?
A) oxygen B) nitrogen C) carbon dioxide D) water
In commercial food manufacturing, what is the purpose of hydrogenation?
A) to make an unsaturated fat more saturated B) to reduce the amount of "empty calories" in a carbohydrate C) to convert fatty acids into amino acids D) to convert vitamins into minerals
Identify a greenhouse gas that can be produced primarily by microorganisms.
A) oxygen B) propane C) sulfur D) methane