Biochemistry : ATP Synthase
Study concepts, example questions & explanations for Biochemistry
All Biochemistry Resources
Example Questions
Example Question #22 : Electron Transport And Oxidative Phosphorylation
Which of the following is false about the structure and function of ATP synthase?
There are six subunits in its ring.
It synthesizes over 100 ATP molecules per second.
It is a membrane-bound protein.
The rotor has 10 to 14 subunits.
At least 10 protons pass through ATP synthase in order to make a molecule of ATP.
At least 10 protons pass through ATP synthase in order to make a molecule of ATP.
ATP synthase can indeed produce more than 100 ATP molecules per second, and in the process, it only requires a few -- three or four -- protons, per ATP. These protons pass down a gradient through the membrane. Hence, the protein is membrane-bound. The protons cause the rotor of 10-14 subunits to spin. The protein's head itself has six subunits, three of which have ADP binding and phosphate binding sites.
Example Question #1 : Atp Synthase
What is the basic mechanism by which ATP synthase generates ATP in the mitochondria?
ATP synthase uses energy from G-protein complexes to phosphorylate ADP to ATP
ATP synthase uses an electron gradient set up by oxidative phosphorylation to drive ATP synthesis
The proton gradient set up by the electron transport chain causes mechanical rotation of ATP synthase, and this energy is used to form ATP
The formation of ATP is energetically favorable and does not require a synthase to be formed
The high energy electrons from oxidative phosphorylation react with the separate components of ATP and drive them together by using ATP synthase
The proton gradient set up by the electron transport chain causes mechanical rotation of ATP synthase, and this energy is used to form ATP
The electron transport chain moves high energy electrons through its complexes in order to create a proton gradient across the mitochondrial inner membrane. The ATP synthase then uses this gradient to pass hydrogen atoms through it. Because this is a favorable movement, it can be coupled to unfavorable processes such as conversion of ADP to ATP.
Example Question #1 : Atp Synthase
ATP synthase catalyzes which of the following reactions?
ATP synthase catalyzes the reaction that shows ADP and the phosphate group forming ATP. The hydrogen in the reactant side is the one involved in the proton gradient, and water is a byproduct of the reaction.
Example Question #1 : Atp Synthase
Which of the following part(s) of ATP synthase is involved in catalysis?
Alpha, beta, and gamma subunits
Alpha subunit
Alpha and beta subunits
Beta subunit
Gamma subunit
Beta subunit
ATP synthase is located in the inner mitochondrial membrane. It has an F0 portion within the membrane and an F1 portion in the matrix. The F1 portion has a hexameric ring structure and is responsible for the creation of ATP from mechanical energy. The alpha, beta, and gamma subunits are all parts of the F1 portion of ATP synthase, however it is only the alpha and beta subunits that form the ring. Further, the beta subunit is the part of the ring that is considered to be catalytic.
All Biochemistry Resources
