Cells Lecture

Cells Lecture - Levels of Organization Atoms Molecules Red...

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Atoms Molecules Cells Levels of Organization Red Blood Cells Tissues Organs Organisms Ecosystems Oak Grassland
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The Cell Theory Every organism is composed of one or more cells Cell is smallest unit having properties of life ontinuity of life arises from Continuity of life arises from growth and division of single cells
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Smallest unit of life Has potential to survive on its own Is highly organized for metabolism The Cell Senses and responds to environment Has potential to reproduce
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Why is this movie unrealistic? Indescribable. .. Indestructible! Nothing Can Stop It! The indestructible creature! Bloated with the blood of its victims!
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Why Are Cells So Small? Surface-to-volume ratio The bigger a cell is, the less surface area there is per unit volume Above a certain size, material cannot be moved in or out of cell fast enough
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Types of Cells Two fundamental types of cells Prokaryotic (“pre-nucleus”) Archaebacteria, Eubacteria Eukaryotic (“true nucleus”) Protistans, Fungi, Plants, Animals
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Prokaryotes: Archaebacteria and Eubacteria Smallest known cells (1µm) No membrane-bound
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Cells Lecture - Levels of Organization Atoms Molecules Red...

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