Biology Lecture 10

Biology Lecture 10 - Archaea cell walls polysacharrides...

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Biology Lecture 10 Prokaryotic cell (Domain Bacteria/Archaea) Simpler, smaller No nucleus/membrane bound organelles Eukaryotic cell (Domain Eukarya) Membrane bound organelles with a nucleus Eukaryotes and archaea are more closely related to each other than bacteria The tree of life is bases on RNA genes Horizontal gene transfer is between organisms in different domains Vertical gene transfer is from parents to offspring Endosymbiosos: suggests that we arose from a combining of two different organisms Prokaryotes: They were the first organisms Thrive in almost any environment Dominate the biosphere Most are prokaryotic are unicellular, however they can form colonies Shapes include: spheres (cooci), rods (bacilli), and spirals Cell Walls Most prokaryotic cells have this Maintains cell shape, provides physical protection, and prevents cell from bursting Bacterial cell walls: peptidoglycan (polymers of sugar and polypeptides)
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Unformatted text preview: Archaea cell walls: polysacharrides Plasma Membranes Both prokaryotic and eukaryotic cells have plasma membranes Separate cell form its surroundings Prokaryotic cells use the plasma membrane to perform specialized operations compared to eukaryotic cells that have specific organelles for specific functions. Prokaryotic cells have less DNA and they don’t put the DNA into a nucleus Eukaryotic cells have associated proteins called histones Organisms are classified by how they obtain energy and how they obtain carbon Energy sources include: light (plants), inorganic material (prokaryotes), and organic material (animals) Carbon sources: carbon dioxide, and organic material Archaea are called extremophiles Extreme halophiles: highly saline environments Extreme thermophiles: very hot environments Other archaea can also live in normal environements...
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Biology Lecture 10 - Archaea cell walls polysacharrides...

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