Why is passive immunity always temporary?

A) all immunity is temporary
B) the antibodies or immune cells are not produced by the body
C) the antibodies are attacked by the bodies acquired immunity
D) acquired immunity replaces passive immunity


Answer: B) the antibodies or immune cells are not produced by the body

Biology & Microbiology

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Transgenic mice are useful to human researchers because they _____

A) can be valuable animal models of human disease B) are essential for mapping human genes C) are now used in place of bacteria for cloning human genes D) were instrumental in pinpointing the location of the huntingtin gene

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The cyclic nitrogenous base used in transcription, uracil, is a ________.

A. purine B. porphyrin C. protein D. pyrimidine

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Of the following hominin species, which appears first in the fossil record?

A. Australopithecus afarensis D. Australopithecus garhi B. Australopithecus africanus E. Paranthropus aethiopicus C. Australopithecus anamensis

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Kinetic energy is best defined as 

A. the energy of position. B. the energy of electrical charge. C. the energy of motion. D. stored energy.

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