GCSE level School biology revision notes: Using microscopes in biology
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MICROSCOPY - the scientific uses of microscopes in biology Light and electron microscopes - preparation of samples for investigation e.g. preparing microscope slides, making sketches of cells and how to estimate the size of a cell and its features e.g. size of nucleus Doc Brown's biology exam revision study notes Some of these revision notes help on how to use a microscope, making up a side ready for study, how to make labelled drawings from your observations and learning how to calculate magnification, advantage of electron microscopes over optical light microscope Sub-index for this section on microscopy - investigation using a microscope
WHERE NEXT? Find your GCSE science course for more help links to revision notes Use your mobile phone or ipad etc. in 'landscape' mode This is a BIG website, you need to take time to explore it [Website Search Box] email doc brown - comments - query? HOME PAGE of Doc Brown's Science UK KS3 Science Quizzes for students aged ~11-14, ~US grades 6 to 8 Biology * Chemistry * Physics notes for GCSE/IGCSE students aged ~14-16, ~US grades 9 to 10 Advanced Level pre-university Chemistry revision notes for students aged ~16-18 ~US grades 11 to 12 aqa gcse 9-1 biology: You should be able to: understand how microscopy techniques have developed over time, explain how electron microscopy has increased understanding of sub-cellular structures, and appreciate the differences in magnification and resolution that have both increased with technological development in microscopy. Know and understand that an electron microscope has much higher magnification and resolving power than a light microscope. This means that it can be used to study cells in much finer detail. This has enabled biologists to see and understand many more sub-cellular structures. You should appreciate the differences in magnification and resolution between a light microscope and an electron microscope. Be able to explain how electron microscopy has increased understanding of subcellular structures. Be able to use prefixes centi (10-2), milli (10-3), micro (10-6) and nano (10-9) (expressing answers in standard form) and carry out calculations involving magnification, real size and image size using the formula: magnification = size of image / size of real object . With light microscopes you can see individual cells and large subcellular structures like the nucleus. With electron microscopes, using a beam of electrons instead of a beam of light, you gain a much higher resolution seeing much smaller objects e.g. the structures of mitochondria, chloroplasts, ribosomes and plasmids.
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