Biology Enzymes ETEA 2023 Retake
PMDC Verified Question 24 of 79
Enzymes are:
A
Can be lipids or proteins
B
Lipids
C
Proteins
D
Carbohydrates
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Proteins
Concept:

Biological macromolecules are divided into four main classes: carbohydrates, lipids, proteins, and nucleic acids. Catalytic molecules fall into a specific class.

Solution:

  • Virtually all metabolic and digestive enzymes in living organisms are composed of long chains of amino acids folded into complex 3D structures.
  • Therefore, by definition, enzymes are universally classified as Proteins.
  • (Note: While RNA ribozymes exist, historically in basic biology curricula, the foundational rule is 'All enzymes are proteins').


Why other options are incorrect:

Lipids (fats) and carbohydrates (sugars) serve mainly as structural components or energy storage; they lack the complex chemical versatility required to form a catalytic active site.

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