Chapter_4_-_A_tour_of_the_Cell

Chapter_4_-_A_tour_of_the_Cell - A tour of the Cell Chapter...

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A tour of the Cell Chapter 4
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The Cell
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Structure of Cells All cells start out life with: Two types:
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Provide windows to the world of cells Light microscopes Electron microscopes Microscopes
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LE 4-1a Eyepiece Ocular lens Objective lens Specimen Condenser lens Light source
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Early Discoveries
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Cell Theory
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Human height Length of some nerve and muscle cells Chicken egg Frog egg Most plant and animal cells Nucleus Most bacteria Mitochondrion Mycoplasmas (smallest bacteria) Ribosome Viruses Proteins Lipids Small molecules Atoms Unaided eye Light microscope Electron microscope Most Cells are Microscopic
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Most Cells are Microscopic Limited by surface-to-volume ratio
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LE 4-2b 30 μ m 10 μ m 10 μ m 30 μ m Surface area of one large cube = 5,400 μ m 2 Total surface area of 27 small cubes = 16,200 μ m 2
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Prokaryotic Cells Relatively small and simple cells No nucleus (nucleoid region) Cytoplasm includes ribosomes
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Prokaryotic Cells Other prokaryotic structures
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Prokaryotic Cells Prokaryotic flagella Ribosomes Capsule Cell wall Plasma membrane Nucleoid region (DNA) Pili
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Eukaryotic Cell
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Animal cells
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Plant cells
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Nucleus – Cell’s Control Center
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Nucleus – Cell’s Control Center
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