The electron transport chain $(ETC)$ is located in:

Given below are two statements.
Statement-$I$: Cytochrome $c$ is a small, copper-containing protein loosely attached to the inner membrane.
Statement-$II$: Cytochrome $c$ acts as a mobile electron carrier transferring electrons between complex $I$, $II$, and $IV$.
In the light of the above statements, choose the correct answer from the options given below.

Final electron acceptor in $ETS$ is

The process of oxidative phosphorylation occurs in .........

In the given diagram of oxidative phosphorylation,what are the regions $P, Q,$ and $R$?

Which of the following enzymes is/are found attached to the inner membrane of the mitochondria instead of the matrix?