MCAT Biochemistry Question 3: Answer and Explanation

Home > MCAT Test > MCAT biochemistry practice tests

Test Information

Question: 3

3. Which of the following statements is most likely to be true of nonpolar R groups in aqueous solution?

  • A. They are hydrophilic and found buried within proteins.
  • B. They are hydrophilic and found on protein surfaces.
  • C. They are hydrophobic and found buried within proteins.
  • D. They are hydrophobic and found on protein surfaces.

Correct Answer: C

Explanation:

Nonpolar groups are not capable of forming dipoles or hydrogen bonds; this makes them hydrophobic. Burying hydrophobic R groups inside proteins means they don’t have to interact with water, which is polar. This makes choice (C) correct. Choices (A) and (B) are incorrect because nonpolar molecules are hydrophobic, not hydrophilic; choice (D) is incorrect because they are not generally found on protein surfaces.

Previous       Next