Transcript Introduction to Cells

Introduction to Cells
Cell Theory
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All organisms are composed of one or more
cells.
The cell is the basic unit of structure and
organization of organisms.
All cells come from pre-existing cells.
Organelles
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Small specialized structures that have a
specific function.
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Contained in all cells.
Some are surrounded by membranes.
Prokaryotic Cells
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Those cells that do not contain membranebound organelles.
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Most unicellular organisms, such as bacteria, are
prokaryotes.
Eukaryotic Cells
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Those cells that do contain membrane-bound
organelles.
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Most multicellular organisms are eukaryotes.
(However, so are some single-celled organisms
such as amoeba.)
Nucleus
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Central membrane-bound organelle which
controls all cellular functions in eukaryotes.
Benefits of Having MembraneBound Organelles
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Separation of cell functions into distinct
compartments.
Ability to carry out various chemical reactions
at the same time.