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3. Which molecule has high chemical energy at the start of cellular respiration? 4. Write the overall summary equation for ce
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3. Glucose has high chemical energy at the start of cellular respiration. Glucose is the starting molecule of cellular respiration because without it ,there couldn't be pyruvate molecule, to be used in Kreb's cycle. It is the primary fuel for starting the cellular respirations.

4. Overall summary equation for cellular respiration,

C​​​​​6​​​​​H​​​​12O6 +6O6 → 6CO2 + 6H2O + ATP ,(Aerobic Respiration)

Complete oxidation of glucose to CO​​​​​2 and H​​​​​​2​​O gives a total gain of 38 ATP molecules. However, in most eukaryotic cells, 2 molecules of ATP are used for transport of NADH produced in Glycolysis into mitochondria for further oxidation. Therefore, net gain of ATP is 36 molecules.

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