Our worksheets cover all topics from GCSE, IGCSE and A Level courses. Exam paper questions organised by topic and difficulty. This is effected under Palestinian ownership and in accordance with the best European and international standards. In the transcription stage of protein synthesis, the section of the DNA molecule where the gene is located (the gene coding for a particular polypeptide) unwinds the hydrogen bonds between the complementary base pairs break, causing the two DNA strands to unzip; Free activated RNA nucleotides then pair up with the exposed bases on Our IGCSE insiders have compressed their years of teacher and examiner knowledge into concise (downloadable) revision notes, step-by-step model answers, focused past papers, and straightforward mark schemes. An image of an animal cell is 30 mm in size and it has been magnified by a factor of X 3000. An equation triangle for calculating magnification. FREE Maths revision notes on Scalars & Vectors. Development of Practical Skills in Biology, 1.2 Practical Skills: Endorsement Assessment, 1.2.1 Practical: Ethical Use of Organisms, 1.2.3 Practical: Dissection of Gas Exchange Surfaces in Fish & Insects, 1.2.5 Practical: Investigating Biodiversity Using Sampling, 1.2.6 Practical: Data loggers & Computer Modelling, 1.2.7 Practical: Investigating the Rate of Diffusion, 1.2.8 Practical: Investigating Water Potential, 1.2.9 Practical: Factors Affecting Membrane Structure & Permeability, 1.2.10 Biochemical Tests: Reducing Sugars & Starch, 1.2.15 Practical: Investigating the Rate of Transpiration, 1.2.16 Practical: Using a Light Microscope, 2.1.6 Eukaryotic Cells Under the Microscope, 2.1.7 Organelles & the Production of Proteins, 2.2.6 Biochemical Tests: Reducing Sugars & Starch, 2.2.16 Finding the Concentration of a Substance, 2.4.5 Enzyme Activity: Enzyme Concentration, 2.4.6 Enzyme Activity: Substrate Concentration, 2.4.8 Coenzymes, Cofactors & Prosthetic Groups, 2.4.9 Practical: 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Control: Transcription Factors, 6.1.5 Gene Control: Post-Transcriptional Modification, 6.1.7 The Importance of Mitosis & Apoptosis, 6.2.4 Predicting Inheritance: Monohybrid Crosses, 6.2.5 Predicting Inheritance: Dihybrid Crosses, 6.2.6 Predicting Inheritance: Identifying Linkage, 6.2.7 Predicting Inheritance: Identifying Epistasis, 6.2.8 Predicting Inheritance: Chi-squared Test, 6.2.9 Continuous & Discontinuous Variation, 6.4.3 Production of Artificial Clones in Plants, 6.4.6 Production of Artificial Clones in Animals, 6.4.12 Standard Growth Curve of Microorganisms, 6.4.13 Factors Affecting the Growth of Microorganisms, 6.4.14 Immobilised Enzymes in Biotechnology, 6.5.7 Testing for Distribution & Abundance, 6.6.6 Balancing Human Need & Conservation, The size of cells is typically measured using the, When doing calculations all measurements must be in the, To convert units, multiply or divide depending if the units are, There are 1000 nanometers (nm) in a micrometre (m), There are 1000 micrometres (m) in a millimetre (mm), There are 1000 millimetres (mm) in a metre (m), Magnification is how many times bigger the image of a specimen observed is in compared to the actual (real-life) size of the specimen, If two separate points cannot be resolved, they will be observed as one point, As light passes through the specimen, it will be, This means that they can be much closer before the diffracted beams overlap, The concept of resolution is why the phospholipid bilayer structure of the cell membrane cannot be observed under a light microscope, The width of the phospholipid bilayer is about 10nm, The maximum resolution of a light microscope is 200nm (half the smallest wavelength of visible light, 400nm), Any points that are separated by a distance less than 200nm (such as the 10nm phospholipid bilayer) cannot be resolved by a light microscope and therefore will not be distinguishable as separate, Light microscopes are useful for looking at, The electrons are picked up by an electromagnetic lens which then shows the image, Electron microscopes are useful for looking at, Electron microscopy requires the specimen to be. Dan graduated from the University of Oxford with a First class degree in mathematics. Designed by the teachers at SAVE MY EXAMS for the CIE AS Biology 2019-21 (9700) syllabus. Designed by the teachers at SAVE MY EXAMS for the AQA GCSE Physics syllabus. Designed by the teachers at SAVE MY EXAMS for the Edexcel GCSE Physics syllabus. Exam paper questions organised by topic and difficulty. Save time and effort by focusing on exactly what you need to know to get the best possible grades, with these effective revision resources. Our worksheets cover all topics from GCSE, IGCSE and A Level courses. FREE Physics revision notes on Experimental Design. Our worksheets cover all topics from GCSE, IGCSE and A Level courses. Serial dilutions. The Physics Class 11 Notes introduced by GeekssforGeeks teaches readers about what oscillation is and different types of oscillations. Give them a try and see how you do! Serial dilutions are created by taking a series of dilutions of a stock solution. 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Step 1: Check that units in magnification questions are the same, 2000 / 1000 = 2, so the actual thickness of the leaf is 2 mm and the drawing thickness is 50 mm, Magnification = image size / actual size = 50 / 2 = 25, eyepiece lens magnification x objective lens magnification, The resolving power of an electron microscope is much greater than that of the light microscope, as structures much smaller than the wavelength of light will interfere with a beam of electrons. As well as teaching maths for over 8 years, Dan has marked a range of exams for Edexcel, tutored students and taught A Level Accounting. Dan has a keen interest in statistics and probability and their real-life applications. EUPOL COPPS (the EU Coordinating Office for Palestinian Police Support), mainly through these two sections, assists the Palestinian Authority in building its institutions, for a future Palestinian state, focused on security and justice sector reforms. FREE Physics revision notes on Energy Stores & Transfers. GCSE Revision Notes IGCSE Revision Notes A Level Revision Notes Biology Chemistry Physics Maths 2022 Advance Information IBO was not involved in the production of, and does not endorse, the resources created by Save My Exams. 0, 2, 4, 6, 8, 10 mmol dm-3); Serial dilutions are completed to create a standard to GCSE Revision Notes IGCSE Revision Notes A Level Revision Notes Biology Chemistry Physics Maths 2022 Advance Information Exam paper questions organised by topic and difficulty. GCSE Revision Notes IGCSE Revision Notes A Level Revision Notes Biology Chemistry Physics Maths 2022 Advance Information IBO was not involved in the production of, and does not endorse, the resources created by Save My Exams. FREE Biology revision notes on The Microscope in Cell Studies. 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