Biology !
which of the following best describes how atp synthase is used in the inner membrane of the mitochondrion during the process of chemiosmosis?

a. it uses the energy of a proton concentration gradient to form atp from adp.
b. it generates atp from adp by absorbing energy released by the calvin cycle.
c. it breaks atp down into adp and releases energy that can be used to do work.
d. it converts atp to atp by removing an inorganic phosphate group into the cytosol.

Option A

Explanation:

In the inner membrane, the proteins move easily with the help of enzyme  

ATP synthase. These photons then starts moving back into the matrix of mitochondria thereby forming proton gradient during the electron transport chain (ETC) with the assistance of enzyme ATP synthase. When the protons flow through the membrane protein ATP synthase they catalyzes and convert ADP to ATP by gaining one extra phosphate ion.

Hence, option A is correct

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.