An individual with Klinefelter syndrome would be a
A. female with underdeveloped ovaries and uterus.
B. male with fully functional testes.
C. male with underdeveloped testes.
D. female with fully functional ovaries and uterus.
Answer: C
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Marjorie takes an anti-anxiety drug so that she can sleep better and remain calm enough to study effectively. She begins by taking 25 milligrams every evening, but within a month this dose is no longer helping, so she takes two pills. After another month this dosage is no longer effective. This is happening because
A. she has developed tolerance, which means that her liver can no longer metabolize the drug, so it remains active for too long. B. her immune system is rejecting the drug. C. the number of receptors to which the drug binds on neurons has increased. D. the number of receptors to which the drug binds on neurons has declined.
The pH optimum is an important factor in digestive enzyme activity because ________.
A. differences in pH in the digestive tract reflect which substrates are broken down at each location B. enzyme activity is lowest within this range, preventing substrates from being broken down too quickly C. it must reflect the pH of the blood in order for substrates to be safely absorbed D. it must be higher than the body fluid in which the enzyme is found in order to be effective
How many primary meridians make up the human body?
a. 10 b. 11. c. 12. d. 13.
An instrument that is used to measure lung volumes is a
A. sphygmomanometer. B. microscope. C. spirometer. D. stethoscope.