Figure 7.2 -What happens at the end of the chain in Figure 7.2? A)Two electrons combine with a proton and a molecule of NAD⁺. B)Two electrons combine with a molecule of oxygen and two hydrogen atoms. C)Four electrons combine with a molecule of oxygen and four protons. D)Four electrons combine with four hydrogen and two oxygen atoms. E)One electron combines with a molecule of oxygen and a hydrogen atom.

Question

Quizplus · Accepted Answer

At the end of the chain, four electrons combine with a molecule of oxygen and four protons to form water (H2O). This process is called oxidative phosphorylation and is the final step in aerobic respiration, producing the majority of ATP molecules in the process. Option A is incorrect as NAD⁺ is not a known compound. Option B is incorrect as it does not involve protons. Option D is incorrect as it involves too many oxygen atoms. Option E is incorrect as it involves only one electron.

Figure 7.2 -What Happens at the End of the Chain in Figure