The energy released as electrons pass along the electron transport chain is used directly to
Correct answer: B. pump hydrogen ions across the inner mitochondrial membrane
- A. split water molecules
- B. pump hydrogen ions across the inner mitochondrial membrane
- C. reduce carbon dioxide
- D. phosphorylate glucose
Explanation
Three carrier complexes use the energy of falling electrons to pump H+ from matrix to intermembrane space, building the gradient that ATP synthase later harnesses. The electrons themselves finally reduce oxygen to water.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Cellular Respiration
Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
Practise Bioenergetics
1,378 free Bioenergetics MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Cellular Respiration questions
For each molecule of glucose completely respired, the total number of carbon dioxide molecules released is
Anaerobic respiration releases much less energy per glucose than aerobic respiration because
In respiration, the oxidation of a substrate molecule essentially means the
The net production of ATP in glycolysis is two molecules per glucose because
One turn of the Krebs cycle, starting from acetyl CoA, directly yields
Where does the Krebs cycle occur?