Introduction of previously nonexistent genes into a
population may be accomplished by
a. nonrandom mating.
b. mutation.
c. sexual recombination.
d. the founder effect.
e. changes in chromosome structure.
Answer: b
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In response to the presence of extracellular antigen, B cells rapidly proliferate and the immunoglobulin M (IgM) proteins produced are soluble rather than anchored in the membrane.This change in IgM protein state is due to:
A. the cleavage of several hydrophobic amino acid residues from the IgM protein. B. the differential expression of two different IgM genes. C. the predominant use of the first 3' end cleavage site of the IgM pre-mRNA. D. inclusion of the M exon in mature IgM mRNA.
Which of the following domains contain prokaryotic cells?
a. Archaea and Bacteria b. Eukarya and Archaea c. Bacteria and Eukarya d. Archaea, Bacteria, and Eukarya
How do terrestrial animals prevent toxic accumulation of ammonia in their tissues?
a. They use ammonia in other metabolic processes. b. They convert ammonia to less toxic forms. c. They vent ammonia across the body wall. d. They eliminate ammonia rather than excreting it.
e. Animals do not produce ammoniaAdaptive radiation is best described as the
A. existence of groups of distantly related species recently evolved from a common ancestor. B. existence of groups of closely related species recently evolved from different ancestors through hybridization. C. existence of individuals of closely related species that originated in different areas within diverse habitats, but that have rejoined as a single species. D. existence of groups of closely related species recently evolved from a common ancestor.