Lecture 3 - The Cellular Level of Organization Cell Theory...

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The Cellular Level of Organization ‘Cell Theory’ 1. Cells are the ‘building blocks’ of animals and plants 2. Cells arise from pre-existing cells 3. Cells are the smallest unit having all the functions of living systems 4. Homeostasis of higher levels of biological organization arises from coordinated activity of cells
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The Typical Cell
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Generalized Cell Structures • Plasma membrane = cell membrane • Nucleus contains genetic material of cell • Cytoplasm: everything between the membrane and the nucleus – cytosol = intracellular fluid – organelles = subcellular structures with specific functions
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Two ‘Categories’ of Organelle 1. Membranous e.g. Plasma membrane Nucleus Mitochondria 2. Non-Membranous e.g. Cytoskeleton Ribosomes
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The Typical Cell
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Membrane Composition Lipid and Protein (and carbohydrate) Principle Membrane Lipid: Phospholipid
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‘Amphipathic Structure’ includes polar (‘head group’) and non-polar (‘tail’) regions
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25-30 nm H 2 O H 2
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This note was uploaded on 09/11/2011 for the course PSIO 201 taught by Professor Stanescu during the Summer '08 term at University of Arizona- Tucson.

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Lecture 3 - The Cellular Level of Organization Cell Theory...

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