Textbook Question
Cyanide (C≡N−) blocks complex IV of the electron transport chain. Suggest a hypothesis for what happens to the ETC when complex IV stops working. Your hypothesis should explain why cyanide poisoning in humans is fatal.
2839
views
3. Energy & Cell Processes
Electron Transport Chain
Multiple Choice
Which of the following statements regarding the electron transport chain is false?
A
The electron transport chain creates a proton gradient across the inner mitochondrial membrane.
B
The electron transport chain is located in the inner mitochondrial membrane.
C
ATP is directly produced by the electron transport chain without any intermediate steps.
D
Oxygen is the final electron acceptor in the electron transport chain.
Verified step by step guidance1
Understand the role of the electron transport chain (ETC) in cellular respiration, which is to transfer electrons through a series of protein complexes located in the inner mitochondrial membrane.
Recognize that the ETC creates a proton gradient across the inner mitochondrial membrane by pumping protons (H+) from the mitochondrial matrix to the intermembrane space.
Identify that the ETC itself does not directly produce ATP. Instead, the proton gradient it creates is used by ATP synthase to produce ATP in a process called oxidative phosphorylation.
Acknowledge that oxygen serves as the final electron acceptor in the ETC, combining with electrons and protons to form water.
Evaluate the statements given in the problem and identify the false one: 'ATP is directly produced by the electron transport chain without any intermediate steps,' which is incorrect because ATP production involves the intermediate step of proton gradient utilization by ATP synthase.
Related Videos
Related Practice
