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e the t is Activity 49A overview of Metabolism (Ho



C6H12O6 + O2 > CO2 + H2O + energy (673 kcal/mol) (1)
1. Add coefficient to balance reaction (1) in model 1.
2. Does reaction (1) release or absorb energy? Is the reaction exothermic or exothermic?
3. Reason (1) is a redox reaction. Work with your team to identify the atom that is reduced and the atom that is oxidized in the reaction. (Recall that when in a molecular compound, oxygen has an oxidation number of -2 and hydrogen had a +1).
Oxidized:         Reduced:
The less oxidized a molecule is, the more energy it has availible to be released even it undergoes oxidation.
C16H32O2 + O2 >
4. Like carbohydrates, fatty acids are metabolized to carbon dioxide and water. Complete and balance reaction (2) in Model (2).
5. apply the shortcut method used with organic molecules to determine which item is oxidized and which is reduced in the reaction (2).
Oxidized:        Reduced:

e the t is Activity 49A overview of Metabolism (Ho

6. The glucose reaction (1) has 6 protons and 6 oxygens, while the fatty acid in reaction (2) has 16 carbons and only 2 oxygens. Which molecule is in a less oxidized (more reduced) state?
7. Would you expect reaction (2) to release more or less energy than reaction (1)? Explain.
8. The oxidation of the fatty acid in module 2 actually releases 2256 kcal/mol.
9. How much energy would be required to synthesize the same molecule in the reverse reaction?

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