2020 · Q29
Which one of the following statements is correct?
general-sciencebiology-human-body
- AGlucose breaks down to CO2, H2O and energy in all organisms
- BGlucose breaks down into ethanol, CO2 and energy in our muscle cell
- CGlucose breaks down into CO2, H2O and energy in all aerobic tissues
- DGlucose breaks down into lactate and energy in yeast
Explanation
In aerobic tissues glucose is completely oxidised: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy, so C is correct. A is wrong because anaerobic organisms (e.g. yeast) yield ethanol and CO₂ instead; B is wrong because human muscle cells produce lactate, not ethanol; and D reverses yeast fermentation, which yields ethanol plus CO₂.