Biology CLEP Prep Practice Exam

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What is the fundamental building block of proteins?

  1. DNA

  2. Amino acids

  3. Carbohydrates

  4. Lipids

The correct answer is: Amino acids

Proteins are large, complex molecules that play essential roles in the structure, function, and regulation of the body's tissues and organs. They are made up of hundreds or thousands of smaller units called amino acids. While DNA (answer A) carries the genetic code for building proteins, it is not the direct building block of proteins. Carbohydrates (answer C) and lipids (answer D) also play important roles in the body, but they are not the building blocks of proteins. This makes answer B, amino acids, the correct choice as the fundamental building block of proteins.

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