Within the mitochondrion, the citric acid cycle occurs in the mitochondrial matrix, and oxidative metabolism occurs at the internal folded mitochondrial membranes (cristae). Cells generate energy ...

The study of cell origins primarily involves the question of how cells became individual units, separate from the external environment and capable of producing energy to sustain themselves.

In liver cancer cells, this results in a massive energy deficiency, the cell cycle is stopped and tumor growth is inhibited.

They graphically represent the life cycle of HIV-1, from the initial binding of the viral particle onto a host cell (Viral Entry), through insinuation into the host cell's nucleus to spark the ...