Exam 1 CAL
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Questions and Answers

Which of the following best describes why plain water would not sufficiently hydrate a patient who has been affected by cholera toxin?

  • The patient needs to be given an intravenous drug to block open chloride channels before being given water.
  • The intestinal cells must be resupplied with ions to prevent water from continually being drawn into the intestinal lumen. (correct)
  • Intestinal cells must only be resupplied with chloride to prevent water from being continually drawn into the intestinal lumen.
  • The intestinal lumen must be resupplied with ions to prevent water from continually being drawn into the intestinal cells.

    • Which of the following situations would a bacterium most likely need to utilize an ATP-binding cassette (ABC) transporter?

  • It needs to secrete exoenzymes to help break down a large polysaccharide into monosaccharides.
  • It needs to move many small sugar molecules inside the cell, against their concentration gradient. (correct)
  • It would not need an ABC because sugar can be transported freely through the cell wall.
  • It needs to move many small sugar molecules inside the cell, down their concentration gradient.

    • Which of the following would best be described as a chronic illness?

  • Bacterial pneumonia that develops about four weeks after an influenza infection.
  • Rocky Mountain Spotted Fever caused by a Rickettsia rickettsii infection from over two weeks ago.
  • Lyme disease caused by a Borrelia burgdorferi infection from three years ago. (correct)
  • Vertical transmission of Listeria monocytogenes from mother to fetus about three days after infection.

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