MCAT Biochemistry Question 79: Answer and Explanation
Home > MCAT Test > MCAT biochemistry practice tests
Test Information
- Use your browser's back button to return to your test results.
- Do more MCAT biochemistry practice tests.
Question: 79
4. Which of the following biomolecules is LEAST likely to contain an aromatic ring?
- A. Proteins
- B. Purines
- C. Carbohydrates
- D. Pyrimidines
Correct Answer: C
Explanation:
Aromatic rings must contain conjugated π electrons, which require alternating single and multiple bonds, or lone pairs. In carbohydrate ring structures, only single bonds are present, thus preventing aromaticity. Nucleic acids contain aromatic heterocycles, while proteins will generally contain at least one aromatic amino acid.