Question

move the events into chronological order to show how electrons move during cellular respiration. place the first event at the top and the last event at the bottom.

nadh transfers electrons to complex i.

oxygen accepts the electrons to form water.

fadh₂ transfers electrons to complex ii.

electrons flow through q, complex iii, and complex iv.

nad⁺ is reduced to nadh and fad is reduced to fadh₂.

Explanation:

1. In cellular respiration, first, \(NAD^{+}\) is reduced to \(NADH\) and \(FAD\) is reduced to \(FADH_{2}\) during earlier stages like glycolysis and the citric acid cycle.
2. Then, \(NADH\) transfers electrons to complex I (as part of the electron - transport chain).
3. \(FADH_{2}\) transfers electrons to complex II (another entry point in the electron - transport chain).
4. After that, electrons flow through \(Q\) (ubiquinone), complex III, and complex IV.
5. Finally, oxygen accepts the electrons to form water (the final step of the electron - transport chain).

Answer:

1. \(NAD^{+}\) is reduced to \(NADH\) and \(FAD\) is reduced to \(FADH_{2}\).
2. \(NADH\) transfers electrons to complex I.
3. \(FADH_{2}\) transfers electrons to complex II.
4. Electrons flow through \(Q\), complex III, and complex IV.
5. Oxygen accepts the electrons to form water.