BIOL 102 Lecture Notes - Lecture 27: Vacuole, Paramecium, Chromatin

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31 Aug 2020
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Eukaryotic ribosomes are either free in the cytosol or attached to membranes like prokaryotic ribosomes, eukaryotic ribosomes consist of large and small subunits, but the structures aren"t identical. Eukaryotic ribosomes are larger, contain 4 types of rrna molecules and 80+ proteins. Similar functions use info in mrna to assemble amino acids into functional proteins. Some eukaryotic ribosomes are freely suspended in cytosol vs others attached to membranes. Free ribosomes in the cytosol make proteins that remain in cytosol, become parts of mitochondria, chloroplasts, cytoskeleton or other cytoplasmic structures, or pass through nuclear pores into the nucleus. The latter become part of chromatin, line the lamins, or remain in nucleoplasm solution. Endoplasmic reticulum (er) network of membranes in the cytosol. An endomembrane system divides the cytoplasm into functional and structural components. Eukaryotic cells have an endomembrane system a collection of interrelated internal membranous sacs that divide the cell into functional and structural compartments. The endomembrane system has a number of functions:

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