The number of water molecules formed when ten electrons move from mitochondrial NADH molecules through the components of electron transport system to molecular oxygen is

20

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15

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10

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5

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Solution

The correct option is D $5$
In respiring mitochondria, each NADH molecule releases two electrons to the electron transport chain; these electrons ultimately reduce one oxygen atom (half of an O2 molecule), forming one molecule of water.
Therefore, 5 molecules of water is formed when 10 electrons move from mitochondrial NADH molecules through the components of electron transport system to molecular oxyge.

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