Section: Biological and Biochemical Foundations of Living Systems

7) Which of the following are steroid-based molecules?
  1. Testosterone
  2. Triglycerides
  3. Progesterone
  4. DNA

Explanation

Common steroid-based molecules commonly seen on the MCAT include testosterone, progesterone, estrogen, cortisol, and aldosterone.

  1. I only, incorrect.
  2. I, II, and III, incorrect, Triglycerides consist of three fatty acids bound by ester linkages to a glycerol backbone.
  3. I and III, correct.
  4. I, III, and IV, incorrect, DNA is not a steroid-based molecule; DNA consists of deoxyribose, a phosphodiester linkage, and a nitrogenous base.

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