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In animal cells, the first stage of glucose breakdown is

1. Krebs cycle
2. glycolysis
3. oxidative phosphorylation
4. E.T.C.

Correct answer: glycolysis

Solution

Glycolysis is the initial stage of glucose catabolism in animal cells, occurring in the cytoplasm and converting glucose into pyruvate. The Krebs cycle, oxidative phosphorylation, and the electron transport chain happen later in cellular respiration.

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