all details about organelles

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Biological Sciences
Rene Harrison

Structure Description Function Proteins Targeting Sequence Chloroplast - arose from phagocytosis - Site of - 90% of proteins are encoded by Transit peptide @ of photosynthetic bacteria photosynthesis nuclear DNA many proteins must amino end - can divide by fission - uses energy and be imported (targeted) to - in plants, eukaryotic sugar (aerobic) chloroplasts alga, some protists and - translated on free ribosomes in the prokaryotes cytosol Thylakoid Sacs (Internal - membranous sacs - thylakoids contain - on thylakoid membrane, are - has thylakoid Membrane System) - arranged into grana chlorophyll encoded by chloroplast genes transfer domain (stacks of thylakoid sacs) - ribosomes assemble on thylakoid (thylakoid proteins) - membrane has 75:25 membrane (like RER) & stop protein lipid ratio transfer sequence retains proteins in -have lumen inside the membrane (electrochemical gradient for light-dep rxn) Stroma Lamellae, - flattened membrane - attach to grana Stroma Thylakoid structure - connect thylakoids (Internal Membrane System) from different grana Stroma - Matrix - Site of dark - has stroma- reactions targeting domain - contains DNA, (stroma proteins) ribosomes, tRNA to encode for 100 genes Outer envelope Contain porin proteins Allow very large molecules through membrane (large channels) - porin: bacteria protein evidence of phagocytosis Inner envelope - Very impermeable membrane - require transporters
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