In a(n) ________, either the immune system fails to develop normally or the immune response is blocked
A) autoimmune disease
B) immunodeficiency disease
C) allergic response
D) cross-reaction
E) agglutination reaction
B
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An experimental subject is isolated in an underground room with no windows, no clocks, and no contact with the outside world. Researchers monitoring his behavior observe that he eats breakfast a little bit later each day. What term best describes the subject's biological activity?
A. Entrainment B. Circadian rhythm C. Free-running rhythm D. Phase shift E. Jet lag
Based on what you know about the characteristics of membrane transport, explain the results shown on the graph. Each mixture consists of equal parts of glucose and fructose at the indicated concentration.
What will be an ideal response?
For fertilization to occur, sexual intercourse must occur no more than ____ hours before ovulation or no later than 24 hours after ovulation
a. 96 b. 16 c. 48 d. 72
An accumulation of ________ and lack of ATP appear to cause cramping and fatigue in muscles.
A. oxygen B. lactic acid C. carbon dioxide D. pyruvic acid