Which of the following is NOT true of a peptide hormone?
A. It diffuses into the cell to cause cellular changes.
B. Cyclic AMP is a common second messenger.
C. It activates a second messenger inside the cell that causes cellular changes.
D. It binds to a receptor on the plasma membrane.
Answer: A
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Nucleic acids are digested within the
A. mouth. B. stomach. C. small intestine. D. pancreas. E. large intestine.
Which of the following is NOT a function of paranasal sinuses?
A. They contain olfactory receptors for the sense of smell. B. They serve as sound-resonating chambers during speech. C. They lighten the skull. D. They increase nasal cavity surface area.
Which of the following is NOT a compensation for respiratory acidosis?
A) The kidney tubule cells will increase secretion of hydrogen ions into the filtrate. B) The kidney tubule cells will increase reabsorption of calcium ions from the filtrate. C) The kidney tubule cells will produce new bicarbonate ions from glutamine. D) The kidney tubule cells will increase reabsorption of bicarbonate ions from the filtrate.
Hypothetically, if the interstitial endocrine cells of a male were selectively killed off by an environmental toxin, which of the following would occur?
A. His voice would become deeper. B. He would experience increased virility. C. He would experience increased hairiness (hirsutism). D. His testosterone levels would decrease.