Cells_ppt - Tour of the Cell Prokaryote bacteria cells...

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Unformatted text preview: Tour of the Cell Prokaryote bacteria cells Types of cells Eukaryote animal cells Eukaryote plant cells ¡ Ribosomes – and microstructure ¢ Mitochondrion - and microstructure ¢ Nucleus –microstructure ¢ Nuclear pores ¢ Chromatin/chromosomes ¢ Nucleolus ¢ Centrosome ¢ Microtubules – and microstructure ¢ Microfilaments ¢ Flagellum ¢ Cilium ¢ Centriole ¢ Lysosome ¢ Golgi complex ¢ Vesicle ¢ Plasmodesmata ¢ Tight junctions ¢ Desmosomes ¢ Gap junctions ¢ Chloroplast - and microstructure ¢ Cell wall – and microstructure ¢ Central vacuole ¡ Endoplasmic Reticulum-Rough and smooth ¡ Peroxisomes ¡ Mitochondria – cristae, self- replicate ¡ Vacuoles: vesicles, contractile vacuoles, tonoplasts ¡ Plastids: chloroplasts, leucoplasts, chromoplasts ¡ Cytoskeleton: microtubules (cilia, flagellae, spindle fibers) and microfilaments (actin, pseudopods) ¡ Centrioles, centrosomes, microtubule organizing centers ¡ Cell wall: -plant: cellulose: primary and secondary wall, and middle lamella-fungi: chitin AP list Cell Size Limits to cell size ¡ Lower limit ¡ smallest bacteria ¡ mycoplasmas ¡ 0.1 to 1.0 micron (μm = micrometer) ¡ most bacteria ¡ 1-10 microns ¡ Upper limit ¡ eukaryotic cells ¡ 10-100 microns ¢ micron = micrometer = 1/1,000,000 meter ¢ diameter of human hair = ~20 microns Cell size is related to function What limits cell size? Surface to volume ratio ¡ as cell gets bigger its volume increases faster than its surface area ¡ smaller objects have greater ratio of surface area to volume 6:1 ~1:1 6:1 s:v Why is a huge single-celled creature not possible? Limits to cell size ¡ Metabolic requirements set upper limit ¡ in large cell, cannot move material in & out of cell fast enough to support life...
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This note was uploaded on 09/22/2010 for the course ABD. 39283 taught by Professor Dr.met during the Spring '10 term at Aachen University of Applied Sciences.

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Cells_ppt - Tour of the Cell Prokaryote bacteria cells...

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