austin cell science
TRANSCRIPT
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”
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.
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
SHAPE OF CELLSSmooth muscle cellOvumEpithelial cellsNerve cellFat cellRBCsSpirogyraSpermAmoebaBacteria
PROKARYOTIC CELLS
Prokaryotic cells are a group of organisms whose cells lack a membrane- bound nucleus
BLUE GREEN ALGAE BACTERIA
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
PARTS OF A CELLCell membraneCytoplasmOrganellesMitochondriaRibosomesGolgi bodiesNucleusNuclear membraneChromosomesVacuoleChloroplastsPlastids