B-cell receptors on B cells are ____
a. IgG molecules only
b. IgE molecules only
c. IgD or IgE molecules
d. IgM or IgD molecules
e. IgM molecules only
ANSWER: d
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Which of the following would not be an example of structure determining function?
A. the highly branched trachea of insects B. the electrical connections between cardiac muscle cells C. the tight packing of epithelial cells on top of the basal lamina D. the brush border of the small intestine E. All of these choices are examples of structure determining function.
For the hierarchy of skeletal muscle organization, which accurately lists the order of structures from "small" to "big"?
A. sarcomere, myofibril, muscle fiber, motor unit B. myofibril, muscle fiber, sarcomere, motor unit C. motor unit, myofibril, muscle fiber, sarcomere D. motor unit, sarcomere, muscle fiber, myofibril E. None of the choices are correct.
The reason that some individual hormones have so many different effects is that
a. they influence gene transcription. b. they trigger a second messenger system that produces a cascade effect. c. there are a great many different cells in different tissues that have specific receptors for the hormone. d. the hormone is carried throughout the body and only a small amount is needed to produce its effect. e. they are polar molecules.
The resistance to reinfection with measles virus following recovery from measles infection is called __________.
A) naturally acquired passive immunity B) natural selection C) innate immunity D) naturally acquired active immunity E) artificially acquired active immunity