MCAT Biology Question — Steroid-Based Molecules | Next Step Test Prep MCAT Biology Question — Steroid-Based Molecules | Next Step Test Prep

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Which of the following are steroid-based molecules?

I. Testosterone
II. Triglycerides
III. Progesterone
IV. DNA

A) I only

B) I, II, and III

C) I and III

D) I, III, and IV

Explanation

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

A) I only, incorrect.

B) I, II, and III, incorrect, Triglycerides consist of three fatty acids bound by ester linkages to a glycerol backbone.

C) I and III, correct.

D) 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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