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The mark schemes can be found in a separate folder so you can check your answers upon completing the questions. The OCRs differ from other examination boards because the questions tend to be more context- and practical-based material rather than theory-based questions of the AQAs, for example. what is the difference between magnification and resolution? OCR (A) A-Level Biology. Gram staining, to visualise different bacteria, is another common use of differential staining. Organs are made up of a range of tissues working together to perform a function and specialised cells of a similar structure and functions are organised into tissues. The inner membrane is folded to form cristae. You’ll be able to identify areas of strength and weakness for effective revision time, solidify your understanding and engage different parts of your brain with mind maps, quizzes and revision notes. Contains a fluid centre, the stroma. 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The specification is divided into topics, each covering different key concepts of biology. Retrouvez OCR A Level Human Biology AS & A2 Revision Guide et des millions de livres en stock sur Amazon.fr. 1. Start revising using our smart flashcards. Found in plants. Practical Skills in Biology . There are four key types of microscopes; optical microscopes, transmission electron microscopes, scanning electron microscopes and laser scanning confocal microscopes. Some cell components and cells are difficult to see unless they are stained a more obvious colour. A free revision guide, workbooks, and MCQs to help you revise thoroughly. Your environment should also be conducive to studying. RER- site of protein synthesis and glycoprotein synthesis. Some parts of the specimen absorb the electrons and this makes them appear dark. A type of Golgi vesicle that releases lysozymes. For this reason only non-living specimens can be examined. 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In short: we provide absolutely everything you need to pass A-Level Biology: Module 1: Development of practical skills in biology, Module 4: Biodiversity, evolution and disease, Module 5: Communication, homeostasis and energy, Module 6: Genetics, evolution and ecosystems, A complete overview of OCR AS & A Level Biology (latest spec), Condensed, easy-to-follow revision notes covering every topic, Unlimited access to updates and additions. Marking instructions may be revised in live papers as appropriate during the lifetime of the qualification. See all formats and editions Hide other formats and editions. The DNA is found as a single, circular molecule in the cytoplasm and it is not associated with histone proteins. The fluid-mosaic model of the membrane refers to the fluidity and range of molecules in the membrane. The OCR A Level Biology A Revision Guide provides comprehensive, specification-matched content, packed with engaging revision and practice material to keep you focused. 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