The brain is located in which body cavity?
a. cranial
b. thoracic
c. spinal
d. abdominal
e. pelvic
ANSWER: a
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An animal virus contains protein, lipid, and DNA. Shown here is the absorption spectra of the three macromolecules purified from the virus. Which of the three samples, A, B, or C, contains DNA?
A. Sample A contains DNA. B. Sample B contains DNA. C. Sample C contains DNA.
Using a specific chemical, a cell biologist has blocked one type of channel-linked receptor in a lab rat's liver tissue. What was the likely mechanism of the chemical she used?
A. The chemical prohibits binding of a ligand to the receptor. B. The chemical prohibits ions from entering the cell via active transport. C. The chemical causes ions to move in the opposite direction of the ion gradient. D. The chemical prohibits second messenger signaling.
A hot, dry summer will reduce crop yields in part because
A) carbon dioxide release is reduced by the stomata closing to prevent excessive water loss. B) carbon dioxide uptake is reduced by the stomata closing to prevent excessive water loss. C) oxygen uptake is reduced by the stomata closing to prevent excessive water loss.
Why do women experience the symptoms of osteoporosis more acutely than men?
A) Men take in more calcium in their diet, so they can't get osteoporosis. B) Women have less bone mass and produce less estrogen later in life; these factors accelerate calcium loss. C) Women have less muscle mass and don't exercise as much. D) Men don't produce estrogen, so they don't rely on it as much as women do.