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Cell Biology

In: Science

Submitted By mzmarie
Words 375
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 Simple organisms-unicellular
 Complex organisms-multicellular

 The cell was discovered by Reginald Hooke in between 1635-1703
• He used a slice cork under the microscope to discover and saw empty spaces, which he called cells
 Cells are the basic unit of life.
• For any structure to be called a cell it will have to have 3 or 4 basic features o (animal) round, plasma membrane (outside), nucleus (middle of the cell), cytoplasm (in btwn the nucleus and the plasma membrane) have 3 components. Be able to draw this. o (plant) square, cell wall (outside) nucleus (next to the cell wall, can have one or two nuclei), cytoplasm (behind the nucleus) be able to draw for test
 Cells are made up of 80-90% water
• The 2 reasons for this is… o Need water for biochemical reactions o Things move around in cells (transportation)
• The remaining 10 % is inorganic and organic materials o Organic materials: Proteins, carbohydrates, lipids, nucleaic acids(macromolecules- major molecules) o Inorganic materials: salts
 Cell theory
• Two German scientists who were credited for the cell theory: Schawn, Schleiden, Virchow o All living organisms are composed of cells. They can either be unicellular or multicellular. o Cells are considered the basic unit of life. o Cells come from pre existing cells. Cells have to divide in order for things to grow.
• Modern Version Cell Theory ^^^ and… o Energy flow occurs within cells. Cells have to be energized to function. o Cells must contain hereditary information. DNA o All cells have the same basic composition

 Two kinds of Cells
• Single cells- prokaryotic cells
• Multicells- eukaryotic cells (humans)
The basic differences btwn single and multi cells
• Eukaryotic cells are more complex than prokaryotic cells.
• Eukaryotic cells have a nucleus and is surrounded/protected by a membrane. Prokaryotic cells don’t...

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