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The first phase in the breakdown of glucose in animals cells is

1. Krebs cycle
2. Glycolysis
3. Electrons transport system
4. Lipid biosynthesis

Correct answer: Glycolysis

Solution

Glycolysis is the first stage of glucose breakdown in animal cells, occurring in the cytoplasm and converting glucose into pyruvate. The Krebs cycle and electron transport system happen later, after glycolysis has already begun energy extraction.

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