Question

The production of ATP from ADP in the presence of enzyme ATP synthase takes place in ___________.

• A. complex I
• B. complex II
• C. complex III
• D. complex V

Answer 1

The correct option is D complex V

The production of ATP from ADP in the presence of enzyme ATP synthase takes place in complex V (ATP synthase).

The carriers i.e., $NADH+H^{+}$ and $FAD{H}_2$ pass electrons to the electron transport chain which in turn passes electrons to oxygen through a series of electron acceptors. The energy available in the electrons is used to pump the protons from the matrix to the intermembrane space. As the protons get accumulated in the intermembrane space it increases the concentration of protons in the intermembrane space. The proton gradient creates a driving force. The protons move back into the matrix of mitochondria through ATP synthase.

ATP synthase has two components, $F_0$ and $F_1$. $F_0$ forms the channel for the passage of protons and $F_1$ has a site for the synthesis of ATP from ADP and inorganic phosphate. These protons provide enough energy for the ADP to combine with inorganic phosphate to form ATP.