Which of the following statements about antibody-mediated immunity is CORRECT?
A. It primarily defends against viruses that have already infected cells.
B. It is responsible for transplant tissue rejection.
C. It protects the body against cells that become cancerous.
D. It defends against parasites, bacteria, and viruses.
E. It primarily defends against bacteria that have already infected cells.
D. It defends against parasites, bacteria, and viruses.
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The control in an experiment
a. makes the experiment valid. b. is an additional replicate for statistical purposes. c. reduces the experimental errors. d. minimizes experimental inaccuracy. e. allows for comparison to the experimental group.
Which is false about estrogen receptors in humans?
a. They are restricted to females. b. They are necessary for sperm maturation. c. They bind the insecticides kepone and DDT, now banned in the U.S. d. Endocrine disruptors affecting them may be responsible for declining sperm counts in western countries. e. All of these are false.
In general, the frequency with which crossing over occurs between two linked genes depends on _________.
A. the phase of meiosis in which the crossing over occurs B. whether the genes are on the X chromosomes or not C. how far apart they are on the chromosomes D. whether the genes are dominant or recessive
Which autoimmune disease is associated with an inflammatory response that can damage the heart muscle and valves?
A. rheumatoid arthritis B. rheumatic fever C. AIDS D. tuberculosis E. myasthenia gravis