Give three properties that distinguish B-1 cells from B-2 cells
What will be an ideal response?
Unlike conventional B-2 cells, B-1 cells express the cell-surface protein CD5, possess few N nucleotides at VDJ junctions, and have a restricted range of antigen specificities. They produce IgM antibodies of low affinity and respond mainly to carbohydrate, rather than protein, epitopes. Individual B-1 cells are polyspecific for antigen; that is, their immunoglobulins bind several different antigens.
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Untreated sleep apnea increases the risk of
A) diabetes. B) memory loss. C) cancer. D) insomnia.
Which of the following is NOT an explanation for inefficient clearing of antibody-antigen complexes that could lead to type III hypersensitivity reactions?
A. High affinity for tissues of particular antigens B. Antigens that are prone to formation of lattices when bound by antibodies C. Highly charged antigens D. Compromised phagocytic system E. All of the above could explain inefficient clearing of antibody-antigen complexes.
The most widely used illicit drug in the United States, ________, is derived from the hemp plant Cannabis sativa.
Fill in the blank(s) with the appropriate word(s).
Which of the following does NOT describe part of the anatomical position?
a.Standing erect b.Gazing upward c.Palms facing forward d.Arms at the side of the body