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 energy source for cellular respiration, producing ATP through glycolysis and oxidative phosphorylation. While fats can provide energy, they're primarily storage molecules. Proteins are mainly used for building and repairing tissues, and fructose requires conversion to glucose before cellular use.

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