Download - Austin Cell Science
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CELL SCIENCE
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WHAT IS A CELL?The cell is the basic structural, functional and biological unit of all known living organisms. It is the smallest unit of life that is classified as a living thing and is often called as “ building block of life”
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ROBERT HOOKE
He is the first person who identified the cells in 1665
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SIZE OF THE CELLSThe smallest cell is 0.1 to 0.5 micrometer in bacteria.
The largest cell measuring 170mm x 130mm, is he ostrich egg.
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THE CELL THEORY
The cell theory states that:
All the living things are composed of cellsCells are the basic units of structure and function in living thingsNew cells are produced from existing cells
Schleiden Virchow Schwann
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SHAPE OF CELLSSmooth muscle cellOvumEpithelial cellsNerve cellFat cellRBCsSpirogyraSpermAmoebaBacteria
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TYPES OF CELLS
Prokaryotic cellsEukaryotic cells
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PROKARYOTIC CELLS
Prokaryotic cells are a group of organisms whose cells lack a membrane- bound nucleus
BLUE GREEN ALGAE BACTERIA
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EUKARYOTIC CELLS
Eukaryotic cells has well organized nucleus with a nuclear membrane.
Ex: All organisms other than blue green algae and bacteria are eukaryotic cells
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PARTS OF A CELLCell membraneCytoplasmOrganellesMitochondriaRibosomesGolgi bodiesNucleusNuclear membraneChromosomesVacuoleChloroplastsPlastids
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PLANT CELL
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