The only immunoglobin that is secreted outside of tissues (found in tears, saliva, mucus, and colostrums), secretory is a dimer held together by a J chain.
A) IgA
B) IgM
C) IgD
D) IgE
Ans: A) IgA
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Which of the following viruses maintains a latent state in nerve cells?
A. herpes virus. B. hepatitis A virus. C. Norwalk virus. D. rotavirus.
____ is a drastic reduction in population size
brought about by severe pressure.
a. A bottle neck b. Mutation c. A founder effect d. Gene flow e. Genetic drift
Which ion channel is responsible for the rising phase of the action potential, and why?
What will be an ideal response?
The amount of time that has passed since two species last shared a common ancestor:
a) is revealed by the degree of similarity in sections of their DNA. b) can be determined for prokaryotic species but not eukaryotes. c) cannot be determined, due to the fact that most species pass through the same embryological stages. d) cannot be determined, due to gaps in the fossil record. e) can be determined by the relative amounts of uranium-238 found in the bones of individuals from each species.