Question

How does mitochondria generate ATP?

Answer 1

Hint: Mitochondria are double membrane-bound cell organelles that generate most of the cell's energy needed for biochemical reactions. Chemical energy produced by the mitochondria is stored in the form of a small molecule called adenosine triphosphate (ATP). Mitochondria have their own DNA which is inherited from their mother.

Complete answer:
As previously mentioned, mitochondria contain two major membranes. The outer mitochondrial membrane fully surrounds the inner membrane, with a little intermembrane space in between. The outer membrane has many protein-based pores that are large enough to permit the passage of ions and molecules as large as a little protein. In contrast, the inner membrane has far more restricted permeability, very similar to the cell wall of a cell. The inner membrane is additionally loaded with proteins involved in electron transport and ATP synthesis.
This membrane surrounds the mitochondrial matrix, where the acid cycle produces the electrons that travel from one protein complex to subsequent within the inner membrane. At the top of this electron transport chain, the ultimate electron acceptor is oxygen, and this ultimately forms water ($H_{2}0$). At an equivalent time, the electron transport chain produces ATP.
During electron transport, the participating protein complexes push protons from the matrix into the intermembrane space. This creates a degree gradient of protons, then another protein complex, called ATP synthase, is used to power synthesis of the energy carrier molecule ATP.
ATP synthase forms ATP from adenosine diphosphate (ADP) and an inorganic phosphate (Pi) through oxidative phosphorylation, which is a process in which enzymes oxidize nutrients to form ATP.

Note:
Mitochondria multiply when the energy needs of a cell increase. Therefore, power-hungry cells have more mitochondria than cells with lower energy needs. For example, repeatedly stimulating a muscle cell will spur the production of more mitochondria in that cell, to keep up with energy demand.Mitochondria, the so-called "powerhouses" of cells, are unusual organelles therein they're surrounded by a double membrane and retain their own small genome. They also divide independently of the cell cycle by simple fission.