Question

Which statement about the chemiosmotic mechanism is not true?
A.. Protons return through the membrane by way of a channel
protein.
(b).. Protons are pumped across a membrane.
(c) Proton pumping is associated with the respiratory chain.
(d)
The membrane in question is the inner mitochondrial membrane.​

Answer 1

Answer:

Proton pumping is associated with the respiratory chain

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Answer 2

Question:

Which statement about the chemiosmotic mechanism is not true?

1. Protons return through the membrane by way of a channel protein.
2. Protons are pumped across the membrane
3. Proton pumping is associated with the respiartory chain
4. The memebrane in question is the inner mitochondrial membrane.
5. ATP is required for protons to return.

Answer:

The incorrect statement is option (5)

ATP is required for protons to return

All other statements given are true.

Explanation:

• The movement of ions across the semi permeable membrane is known as Chemiosmotic mechanism.
• It is called as Chemiosmosis due to the diffusion of hydrogen ions or proton from the  higher concentration to lower concentration and also ATP can be formed by the electrochemical concentration gradient of proton across the membrane.
• Diffusion force and electrostatic force are the two main factors for the movement of ions.
• In this the proton is pumped to the intermembrane space from the matrix and the energy is stored in the form of transmembrane electrochemical gradient.
• By using the enzyme ATP synthase the proton flow back to the inner membrane and the energy produced is used to combine ADP with inorganic phosphate and it forms ATP.
• Therefore ATP is not required for proton to return.
• The incorrect statement given is Option (5)

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