Cell Ultrastructure (Eukaryotic) Cell Ultrastructure notes, biology aqa AS unit one 3.0 / 5 based on 1 rating ? BiologyCellular processes and structureASAQA Created by: StephanieCreated on: 12-05-12 14:35 Plasma Membrane Made of lipids, proteins and carbs Regulates movement of molecules in and out Receptor molecules on surface allow cell to respond to chemicals 1 of 9 Nucleus Double membrance (envelope) with nuclear pores contains chromatin - controlls cell activies because made from DNA often contains nucleolus (makes ribosomes) 2 of 9 Lysosome contains many digestive enzymes digest invading or worn out cells 3 of 9 Ribosome small organelle used in protein synthesis floats free in cytoplasm or attatchd to RER 4 of 9 Endoplastic Reticulum Smooth & Rough RER Both membrance enclosed fluid spaces Smooth synthesises lipids Rough is covered in ribosomes - folds and processes proteins made there 5 of 9 Golgi Apparatus Fluid filled (flattened sacks) Packages and proccess proteins and lipids Makes lysosomes 6 of 9 Microvilli Folds in the plasma membrance Increase surface are for absorption 7 of 9 Mitochondria Double membrane Folds in inner membrance called 'cristae' Inner fluid called matrix Site of Aerobic Respiration Produces ATP needed for muscle contraction, active transport, etc 8 of 9 Intestinal Epithelial Cell -structural adaptations Arranged in Villi Individual cells have microvill - greater surface area for absorption 9 of 9
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