Which of the following statements are incorrect about aerobic respiration?
(i) The first step is the break-down of glucose into pyruvate.
(ii) Glucose is a six-carbon molecule and pyruvate is a three-carbon molecule.
(iii) The breakdown of glucose take place in the mitochondria.
(iv) The breakdown of pyruvate using oxygen takes place in the cytoplasm.
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[C] Both (iii) and (iv)
The first step is the break-down of glucose, then, a six-carbon molecule, into a three- carbon molecule called pyruvate and it takes place in the cytoplasm. You must know that Breakdown of pyruvate using oxygen takes place in the mitochondria.
Further, the pyruvate may be converted into C₂H₅OH (ethanol) and carbon dioxide (CO₂). It occurs in yeast during fermentation. And this process takes place in the absence of air (which is oxygen), so, it is called anaerobic respiration.