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Go through the following statements abou...

Go through the following statements about the chemiosmotic mechanism -
I. Protons are pumped across the membrane
II. Protons return through the membrane by way of a channel protein.
III. ATP is required for protons to return.
IV. The memebrane in question is the inner mitochondrial membrane.
V. Proton pumping is associated with the respiartory chain

A

V is incorrect

B

III is incorrect

C

All are incorrect except III

D

Only III is correct

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the statements about the chemiosmotic mechanism, let's evaluate each statement one by one: ### Step 1: Evaluate Statement I **Statement I:** Protons are pumped across the membrane. **Evaluation:** This statement is correct. In the chemiosmotic mechanism, protons (H⁺ ions) are indeed pumped across the inner mitochondrial membrane, creating a proton gradient. ### Step 2: Evaluate Statement II **Statement II:** Protons return through the membrane by way of a channel protein. **Evaluation:** This statement is also correct. Protons return to the mitochondrial matrix through specific channel proteins, often referred to as ATP synthase, which allows protons to flow back into the matrix. ### Step 3: Evaluate Statement III **Statement III:** ATP is required for protons to return. **Evaluation:** This statement is incorrect. The return of protons through the channel protein (ATP synthase) occurs via facilitated diffusion due to the proton gradient, and does not require ATP. ### Step 4: Evaluate Statement IV **Statement IV:** The membrane in question is the inner mitochondrial membrane. **Evaluation:** This statement is correct. The inner mitochondrial membrane is indeed the site where the chemiosmotic mechanism occurs, including the establishment of the proton gradient. ### Step 5: Evaluate Statement V **Statement V:** Proton pumping is associated with the respiratory chain. **Evaluation:** This statement is correct. Proton pumping is directly associated with the electron transport chain, which is part of cellular respiration. ### Conclusion: - **Correct Statements:** I, II, IV, and V - **Incorrect Statement:** III ### Final Answer: The correct statements about the chemiosmotic mechanism are I, II, IV, and V. Statement III is incorrect. ---
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