Question

Chemiosmotic theory of ATP synthesis taking place in the mitochondrion is based on

• A. ${Ca}^{+}$ gradient.
• B. $K^{+}$ gradient.
• C. $H^{+}$ gradient.
• D. ${Na}^{+}$ gradient.

Answer 1

Answer: (C)

$H^{+}$ gradient.

Chemiosmosis is the movement of ions across a semipermeable membrane. This involves the movement of ions down their electrochemical gradient. This process is used for the production of energy in the form of ATP in mitochondria. This theory is known as chemiosmotic theory. There is a gradient of H${}^{+}$ ions which moves across the membrane. This movement of protons results in the production of energy with the help of ATP synthase.

Thus, the correct answer is option C.