Multiple choice

Which of the following is regarded as main cellular fuel?

  1. Protein

  2. Fat

  3. Fructose

  4. Glucose

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Glucose is the primary fuel for cellular respiration, producing ATP through glycolysis and oxidative phosphorylation. While fats can provide energy, they require breakdown first. Proteins are primarily for building structures, and fructose must be converted to glucose for cellular use.

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