school
Acemy

Cellular Respiration

AP Biology· difficulty 3/5

The diagram shows electron flow through Complexes I-IV and proton pumping in the inner mitochondrial membrane.

Intermembrane space (high H+) Matrix (low H+) I II III IV ATP synthase H+

What is the final electron acceptor in this electron transport chain?

  • A

    ATP, which is hydrolyzed

  • B

    NAD+, which is reduced to NADH

  • C

    Oxygen (O2), which is reduced to water

    check_circle
  • D

    Glucose, which is oxidized to CO2

Explanation

O2 accepts electrons at Complex IV, where it is reduced to H2O. Without O2, the chain backs up and ATP synthesis halts.

Want 10 more like this — adaptive to your weak spots?

Practice 10 like thisarrow_forwardPredict my AP score

Related questions

auto_awesomeAll Toolsquestion_answerHomework Q&Amenu_bookAP & SAT PreptimelineLearn Mode