This lesson describes how the eyepiece graticule and stage micrometer are used to measure the size of an object with an optical microscope. The PowerPoint and accompanying resource have been designed to cover the second part of point 2.1.3 of the AQA A-level Biology specification
The main task of this concise lesson involves a step by step guide which walks students through the methodology and the use of the scale on the stage micrometer to identify the size of the divisions of the eyepiece graticule. This will need them to convert between units and as this was covered in the previous lesson, a number of prior knowledge checks will check that they are able to do this. Moving forwards, the students are challenged to apply this method to a series of exam-style questions and the mark scheme is displayed on the PowerPoint so that they can assess their understanding.
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Topic 2: Cells (AQA A-level Biology)
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Topic 2.1: Cell structure (AQA A-level Biology)
This bundle of 9 lesson PowerPoints and accompanying resources contain a wide variety of tasks which will engage and motivate the students whilst covering the details of topic 2.1 of the AQA A-level Biology specification. Cells and their structure are linked to all of the other 7 topics in this course so a clear understanding is critical to a student's success. The tasks which include exam-style questions (with displayed mark schemes), discussion points and quiz competitions will cover the following parts of topic 2.1: * The structure and function of the cell-surface membrane, nucleus, nucleolus, mitochondria, chloroplasts, Golgi apparatus, lysosomes, ribosomes, RER and SER, cell wall and cell vacuole * The specialised cells of complex, multicellular organisms * The structures of a typical prokaryotic cell * The differences between prokaryotic and eukaryotic cells * The structure of viruses * The principles and limitations of optical microscopes, transmission electron microscopes and scanning electron microscopes * Measuring the size of an object using an optical microscope * Using the magnification formula * The principles of cell fractionation and ultracentrifugation If you would like to sample the quality of these lessons, then download the eukaryotic animal cells, viruses and microscopes lessons as these have been uploaded for free
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