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Transcript
Higher Biology Cell Ultrastructure By the end of this lesson: You should be able to: Know what an organelle is Recognise the following: ribosomes; nucleus; rough endoplasmic reticulum; chloroplasts; mitochondrian; Golgi Body Label named organelles on diagrams Know the functions of named organelles 2 Electron Microscope The light microscope has limited magnification. The electron microscope uses a beam of highly energetic electrons to examine objects on a very fine scale. This examination can yield the following information: Topography The surface features of an object or "how it looks", its texture; direct relation between these features and materials properties (hardness, reflectivity...etc.) 3 Electron Microscope Morphology The shape and size of the particles making up the object; direct relation between these structures and materials properties (ductility, strength, reactivity...etc.) Composition The elements and compounds that the object is composed of and the relative quantities of them; direct relationship between composition and materials properties (melting point, reactivity, hardness...etc.) 4 Typical Animal Cell Using a light microscope 5 Typical Animal Cell Using an electron microscope Much more detail is revealed 6 Typical Animal Cell Using an electron microscope The extra structures seen are called organelles 7 Typical Animal Cell Each organelle has a specific function. (Like miniorgans) 8 9 Typical Plant Cell Using a light microscope 10 Typical Plant Cell Using an electron microscope 11 Ultrastructure Insert and complete the “Cell Ultrastructure” sheet from your pack into your notes. 2. Draw a table to show the functions of the following 7 cell structures: 1. Mitochondria Ribosome Rough Endoplasmic Reticulum Chloroplasts Nucleus Golgi body Cell membrane Use Pages 317-318 of Torrance 12 By the end of this lesson: Can you do it? Know what an organelle is Recognise the following: ribosomes; nucleus; rough endoplasmic reticulum; chloroplasts; mitochondrian; Golgi Body Label named organelles on diagrams Know the functions of named organelles 13