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Cell Structure
According to the cell theory (which is certainly correct),
every living organism - plant, animal, or otherwise
- is made of cells, and all cells arise from pre-existing
cells.
The simplest organisms, like amoebas and bacteria,
are made of only one cell; in other words, they are unicellular. Complex organisms such as plants,
fungi, and humans and other animals are made up of many,
many cells; in other words they're multicellular.
Look at the following diagram, and think of a cell
as having three main areas:
- the cell wall and/or membrane, which
forms the outer layer,
- the cytoplasm, in which the organelles
are found, and
- the nucleus, which is bounded by a nuclear
membrane, and in which chromosomes are
located.
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