Multiple choice

Which of the following is used as a cellular respiration indicator?

  1. Tetrazolium chloride

  2. Lactic acid

  3. Ethanol

  4. Schiff's reagent

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A Correct answer
Explanation

Tetrazolium chloride is a colorless compound that turns red/purple when reduced by cellular respiration enzymes, making it a reliable indicator of metabolic activity. Lactic acid and ethanol are fermentation products, while Schiff's reagent detects aldehydes.