The sensors in the brainstem breathing control centers respond primarily to the concentration of
A. oxygen.
B. carbon dioxide.
C. bicarbonate ions.
D. hemoglobin.
E. hydrogen ions.
E. hydrogen ions.
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Some compounds are themselves not carcinogens, but their metabolic activity on the compound produces intermediates that are carcinogenic. This process is known as
A) precarcinogenesis. B) carcinogen activation. C) metabolic carcinogenesis. D) plasminogen activation. E) DNA mutagenesis.
Small populations on islands can be said to have experienced a form of genetic drift called the
founders effect.
Indicate whether the statement is true or false.Which one of the following is a characteristic of open circulatory systems but NOT closed circulatory systems?
A) a heart B) a vascular system C) blood D) open-ended blood vessels
Gametophyte plants produce
A. spores. B. eggs. C. pollen. D. None of the above is correct.