According to the chemiosmotic theory, ATP is synthesised when
Correct answer: B. protons flow back into the matrix through ATP synthase
- A. electrons are transferred directly to ADP
- B. protons flow back into the matrix through ATP synthase
- C. NADH transfers a phosphate group to ADP
- D. oxygen binds to ADP in the matrix
Explanation
Electron transport pumps protons out of the matrix into the intermembrane space, creating an electrochemical gradient, and the energy released as those protons flow back through the ATP synthase channel drives the phosphorylation of ADP. Nothing is transferred directly from an electron or from NADH to ADP, which is the difference between oxidative and substrate level phosphorylation.
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
The final acceptor of electrons in aerobic respiration is
How many molecules of NADH are produced in one turn of the Krebs cycle?
The first reaction of the Krebs cycle is the combination of acetyl CoA with
The infoldings of the inner mitochondrial membrane are called
Anaerobic breakdown of glucose by yeast yields
The essential function of converting pyruvic acid to lactic acid in an oxygen starved muscle is to