OCR A Level Biology:复习笔记2.1.5 Eukaryotic Cells
Eukaryotic Cell Structure Cell surface membrane The structure of the cell surface membrane – although the structure looks static the phospholipids and proteins forming the bilayer are constantly in...
OCR A Level Biology:复习笔记2.1.4 Magnification & Resolution
Magnification Formula Magnification is how many times bigger the image of a specimen observed is in comparison to the actual (real-life) size of the specimen The magnification (M) of an object can ...
OCR A Level Biology:复习笔记2.1.3 Drawing Cells
Drawing Cells To record the observations seen under the microscope (or from photomicrographs taken) a labelled biological drawing is often made Biological drawings are line pictures which show spec...
OCR A Level Biology:复习笔记2.1.2 Using a Microscope
Preparation of Microscope Slides Many biological structures are too small to be seen by the naked eye Optical microscopes are an invaluable tool for scientists as they allow for tissues, cells and ...
OCR A Level Biology:复习笔记2.1.1 Studying Cells
Use of Microscopy Microscopes can be used to analyse cell components and observe organelles Magnification and resolution are two scientific terms that are very important to understand and distingui...
OCR A Level Biology:复习笔记1.2.16 Practical: Using a Light Microscope
Practical: Using a Light Microscope Many biological structures are too small to be seen by the naked eye Optical microscopes are an invaluable tool for scientists as they allow for tissues, cells a...
OCR A Level Biology:复习笔记1.2.15 Practical: Investigating the Rate of Transpiration
Practical: Investigating the Rate of Transpiration Using a potometer Air movement, humidity, temperature and light intensity all have an effect on the rate at which transpiration occurs The table b...
OCR A Level Biology:复习笔记1.2.14 Serial Dilutions
Serial Dilutions Serial dilutions are created by taking a series of dilutions of a stock solution. The concentration decreases by the same quantity between each test tube They can either be ‘doubli...
OCR A Level Biology:复习笔记1.2.13 Chromatography
Chromatography Chromatography is a technique that can be used to separate a mixture into its individual components Chromatography relies on differences in the solubility of the different chemicals ...
