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One of the features that nearly all living things have in common is that they are made of very tiny units called cells. Cells are similar in all animals and plants, from the very simplest life forms to the most complicated. Plant cells are usually more rectangular, whereas animal cells are generally more rounded or spherical.
Cells were discovered by Robert Hooke (1635 - 1705) in cork A cell is the basic unit of animal and plant form and structure. Schwann and Schleiden postulated in 1838 that all organisms are composed of cells and they were the first persons who distinguished between animal and plant cells.
In this section we will study certain aspects of cellular structure and organization. We will confine our study to selected components of the cell.
The following structures and organelles will be studied:
