[Campbell Biology P.124] Which statement about proteins and enzymes is TRUE, according to th... | Practice Question

Which statement about proteins and enzymes is TRUE, according to the provided text?

  • A: Enzymes are consumed during the chemical reactions they catalyze.
  • B: Proteins account for less than 25% of the dry mass of most cells.
  • C: All enzymes are proteins, regulating metabolism by acting as catalysts.
  • D: Proteins are biologically functional molecules composed of one or more polypeptides.

Explanation

The text explicitly states that 'A protein is a biologically functional molecule made up of one or more polypeptides, each folded and coiled into a specific three-dimensional structure.' Options A, B, and C contain inaccuracies regarding enzyme consumption, protein dry mass percentage, and the scope of enzymes being proteins, respectively.