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
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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
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
Companion cell assisted loading of organic compounds is indicated by letter ____
a. A b. B c. C d. D
e. EIf 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