Describe the differences in function of the five immunoglobulin classes. What will be an ideal response?


Concepts to Consider: IgA--in mucus, tears, saliva, and milk; it prevents microorganisms from
attaching to epithelial surfaces; in respiratory passages, digestive, urinary, and reproductive tracts; it
fights against inhaled or ingested pathogens. IgD--in plasma, on B cell surface; activates B cells after
antigen binding. IgE--in plasma; binds to mast cells causing release of histamine; also aids in fight
against parasitic worms. IgG and IgM--in plasma; defends against bacteria, viruses, fungi; interacts
with macrophages and activates complement system.

Biology & Microbiology

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Under the neutral model, allele frequency distributions are the product of:

a. effective population size. b. mutation rate. c. selection. d. A and B. e. None of the above.

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Physiological temperature regulation that is typical of endotherms is impaired only by lesions in the

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Biological growth involves an increase in:

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Biology & Microbiology