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lecture.04 - EUKARYOTES basic features of all cells plasma...

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EUKARYOTES - basic features of all cells: - plasma membrane - a selective barrier that allows sufficient passage of oxygen, nutrients, and waste to service the volume of the cell - general structure is a double layer of phospholipids - semifluid substance called the cytosol - chromosomes (carry genes) - ribosomes (make proteins) - prokaryotic cells lack a nucleus and membrane-bound organelles - eukaryotic cells are generally much larger than prokaryotic cells - eukaryotic cells have membrane-bound organelles - eukaryotic cells have DNA in a nucleus that is bounded by a membranous nuclear envelope
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Eukaryotes: Panaramic View - plant and animal cells have most of the same organelles
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Eukaryotes: Nucleus - the nucleus contains most of the cell’s genes and is usually the most conspicuous organelle - the nuclear envelope encloses the nucleus, separating it from the cytoplasm ; made of two contiguous membranes - interior primarily of chromatin , DNA and associated proteins - the nucleous manufactures tRNA , which leaves the nucleus to be transcribed into proteins - the nucleolus manufactures rRNA is manufactured, which leaves the nucleus to combine with ribosomes
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