A network of interactions that involves the cycling of
materials and the flow of energy among organisms
and their physical environment is
a. a population.
b. a community.
c. an ecosystem.
d. the biosphere.
e. the habitat.
Answer: c
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What determines the specificity of a receptor protein?
A. the cytoplasmic domain B. the transmembrane domain C. the ligand-binding site D. the extracellular domain
Which hominoids may have given rise to the apes and humans?
a. Pan b. Pongo c. Aegyptopithecus d. Dryopithecines e. Australopithecus
The common characteristic of Alveolata is
A. silica covering. B. funnel-shaped, contractile collar. C. a single, unique mitochondria. D. presence of a plasmodium. E. a layer of flattened vesicles beneath the plasma membrane.
The problem with tissue rejection following organ transplants
A. is due to the tissues being recognized as nonself, and therefore being treated as a foreign substance. B. can be reduced by administering immunosuppressive drugs. C. can be reduced if the organ donor is a close relative with very similar tissue proteins. D. All of the choices are correct. E. None of these are correct.