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Introduction to Study of Cells

We know that all living creatures are made of cells. There are millions of different types of cells. The simplest forms of life such as amoeba and bacteria are solitary cells. Highest organisms, including ourselves, are communities of cells such as brain cells, skin cells, liver cells, stomach cells and so on, each performing specialised functions.

The cell is the basic unit of life. The study of the structure of cell constitutes a separate branch of biological sciences called cytology.

Cytology deals with the study of cells from morphological, biochemical, physiological, developmental, genetical, pathological and evolutionary points of view. This branch of biology has enabled biologists to understand the basic clues of life and is one of the most important aspects of modern biology.

Definition Of Cell

All organisms—from single-celled bacteria and protozoans to higher organisms (plants and animals)— are composed of cells.
A cell is the structural and functional unit of all organisms. It is the building block of all living organisms and the smallest unit of life capable of performing all living functions.

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