MCAT Biology Question 1: Answer and Explanation

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Question: 1

1. Hyperbaric oxygen may be used as a treatment for certain types of bacterial infections. In this therapy, the patient is placed in a chamber in which the partial pressure of oxygen is significantly increased, increasing the partial pressure of oxygen in the patient's tissues. This treatment is most likely used for infections with:

  • A. obligate aerobic bacteria.
  • B. facultative anaerobic bacteria.
  • C. aerotolerant anaerobic bacteria.
  • D. obligate anaerobic bacteria.

Correct Answer: D

Explanation:

Obligate anaerobes cannot survive in the presence of oxygen and would likely be killed by such a therapy, treating the infection. The other types of bacteria listed can all survive in the presence of oxygen and would likely not be treated using this therapy.

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