Lupus erythematosus is an autoimmune disorder in which the body attacks
A) its own connective tissue.
B) the brain.
C) the spleen.
D) its own antibodies.
E) heart tissue.
A
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Why is terrestrial productivity higher in equatorial climates?
A) Productivity increases with temperature. B) Productivity increases with water availability. C) Productivity increases with available sunlight. D) The answer is most likely a combination of the other responses.
Iron-oxidizing bacteria grow better in alkaline environments where protons are less likely to abiotically convert Fe2+ into Fe3+
Indicate whether the statement is true or false.
Why is antigenic drift a problem for the immune system?
A. It requires a new, primary response by B cells. B. The ability of MHC to present antigen is affected. C. T cell receptors may not recognize the altered antigen. D. Two answer options are correct: It requires a new, primary response by B cells AND T cells may not recognize the altered antigen.
A(n) ____________ occurs when a bit of material enters Earth's atmosphere and becomes incandescent due to friction with the atmosphere
Fill in the blank(s) with correct word