Bacterial cells close bacterial cell A microscopic individual cell of a bacterium. have a more simple structure compared to animal, plant and fungal cells and are usually much smaller.

Bacteria are among the smallest living things. A single bacterium consists of just one cell. Not all bacteria are harmful. There are different unicellular organisms and types of bacteria.

The study of cell origins primarily involves the question ... actually evolved from collaboration between an archaeon and a bacterium. Scientists study the structure and function of mitochondria ...