Radioactive radon gas is emitted from ____

a. rocks and soil
b. medical x-rays
c. cosmic radiation
d. nuclear medicine
e. uranium mines


ANSWER: a

Biology & Microbiology

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Which of the following is a source of genetic variation?

A. genetic recombination B. gene flow C. natural selection D. genetic drift E. adaptations

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To process information, postsynaptic neurons often add up simultaneous signals from several presynaptic neurons. Which structure and process allow them to do so?   A.  axons; temporal summation

A.  axons; temporal summation B.  axons; spatial summation C.  dendrites; temporal summation D.  dendrites; spatial summation

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Companion cell assisted loading of organic compounds is indicated by letter ____

a. A b. B c. C d. D

e. E

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If a diploid organism has a genome consisting

of 4 pairs of chromosomes, it can produce ____ different combinations of maternal and paternal chromosomes (disregarding crossing over). a. 4 b. 8 c. 12 d. 16 e. 32

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