OCR BIOLOGY microscopy, cells, organelles, gaseous exchange and the heart 4.5 / 5 based on 32 ratings ? BiologyASAll boards Created by: eleanorCreated on: 02-11-09 16:21 What is magnification? the degree to which the size of an image is larger than the object itself 1 of 23 What is resolution? the degree to which it is possible to distinguish between two objects 2 of 23 What is the resolution of an electron microscope? 0.1nm 3 of 23 What is the resolution of a light microscope? 200nm 4 of 23 What is the max. magnification of a TEM microscope? x500,000 5 of 23 What is the max. magnification of a SEM microscope? x100,000 6 of 23 What does the cytoskeleton refer to? the network of protein fibres that give shape and structure to the cell 7 of 23 What does the Golgi Apparatus do? recieves proteins from the ER and modifies them, to be transported via vesicles 8 of 23 A phosphate head is? hydrophilic 9 of 23 A fatty acid tail is? hydrophobic 10 of 23 What is a fluid mosaic? the model of a cell membrane structure 11 of 23 When a phospholipid molecule has a carbohydrate part attached to it, it is called a... glycolipid 12 of 23 When a protein molecule has a carbohydrate part attached to it, it is called a... glycoprotein 13 of 23 Why do good exchange surfaces have a thin barrier? to reduce diffusion distances 14 of 23 In humans, where in the lungs does gas exchange take place? the alveoli 15 of 23 How thick is the alveolus wall? 1 cell thick 16 of 23 What is better, a double or single circulatory system? double 17 of 23 What is the cardiac cycle? the sequence that happens in a heartbeat 18 of 23 What starts the cardiac cycle? The sinoatrial node 19 of 23 Where is lymph held? in the lymphatic system 20 of 23 What does each subunit of a haemoglobin contain? polypeptide chain and haem group 21 of 23 Oxyhaemoglobin is formed when... haemoglobin takes up oxygen 22 of 23 The Bohr Effectrefers to a change in shape of the oxyhaemoglobin curve when... carbon dioxide is present 23 of 23
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