Which of the following is not considered a contributor to the destruction of stratospheric ozone?
a. carbon dioxide
b. chlorofluorocarbons
c. methyl chloroform
d. methyl bromide
e. carbon tetrachloride
A
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Radiolarians have characteristic ____, which are thin, ray-like strands of cytoplasm supported internally by bundles of
____.
a. axopods; microfilaments b. axopods; microtubules c. spicules; microfilaments d. spicules; microtubules
e. microfilaments; axopodsEmbryonic stem cells derived from blastocysts are pluripotent, and therefore useful in stem cell research because they
________. a. are viable under a wide range of laboratory conditions b. do not replicate and are therefore stable long-term c. can form all cells, tissues, and organs of the human body d. are specialized and therefore arrested in G0 e. function to replace damaged or diseased body parts in adults
On a statistical basis, smoking a single cigarette lowers your life expectancy by
A. 10.7 minutes. B. 35 minutes. C. 2 hours. D. 24 hours. E. 5 minutes.
What feature do monkeys share with iguanas but not with bullfrogs?
A. thoracic breathing B. four-chambered heart C. eggs D. eyes