Question

Cellular respiration has 3stages. Which stage(s) ofcellular respiration require(s)oxygen?A. Glycolysis onlyB. Krebs Cycle onlyC. Electron Transport Chain onlyD. Krebs Cycle and Electron TransportChain

Answer 1

3 stages of cellular respiration:

0. Glycolysis, = It happens in the cytoplasm. It breaks down glucose to pyruvic acid. It does not use oxygen.

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1. Krebs Cycle, = It happens inside the mitochondria (matrix). It uses pyruvate to produce ATP. Its other names are Tricarboxylic acid and Citric acid cycle. It does not use oxygen but produces carbon dioxide.

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2. Electron Transport Chain, = It also happens inside the mitochondria (intermembrane space). It uses the NADH and FADH produced from the Krebs Cycle. It also uses oxygen to produce water.

ANSWER: C. Electron Transport Chain only