A researcher is comparing atmospheric CO2 levels in Earth's northern and southern hemispheres during June-August. As more terrestrial plants are present in the northern hemisphere, what do you expect she will find?
A. Atmospheric CO2 measurements will be
greater in the northern hemisphere.
B. Atmospheric CO2 measurements will be
greater in the southern hemisphere.
C. As atmospheric CO2 measurements
represent global amounts, measurements in
the northern and southern hemispheres will
be (approximately) the same.
C
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Which of the following viruses has not been determined to be associated with a particular type of cancer?
A) mimivirus B) hepatitis B virus C) Epstein-Barr virus D) human papilloma virus E) hepatitis C virus
Why does extended hypoglycemia (low blood sugar) lead to confusion and difficulty thinking?
A. Glucose provides energy for brain cells. B. Unregulated pH of body fluids causes these symptoms. C. Glucose is major source of energy for non-nervous system cells. D. Glucose is required for chemical reactions in the body.
The _____ is a type of regulator protein that binds to a region of DNA in the promoter of a gene called the operator and prevents transcription from taking place.
A. inducer B. repressor C. activator D. inactivator E. terminator
Calcium, when written as Ca2+, represents _____.
A) molecular calcium B) elemental calcium C) calcium ion D) a calcium free radical E) one of the several calcium isotopes