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 ...
OCR A Level Biology:复习笔记1.2.12 Biochemical Tests: Proteins
Biochemical Tests: Proteins The Biuret test can be carried out quickly and easily in a lab to determine if a sample contains proteins Biuret ‘reagent’ contains an alkali and copper (II) sulfate whi...
OCR A Level Biology:复习笔记1.2.11 Biochemical Tests: Lipids
Biochemical Tests: Lipids Identifying biological molecules Different qualitative reagents can be used to identfy the presence of biological molecules in samples Ethanol is used to identify lipids B...
OCR A Level Biology:复习笔记1.2.10 Biochemical Tests: Reducing Sugars & Starch
Biochemical Tests: Reducing Sugars & Starch Benedict’s solution can be used to carry out a semi-quantitative test on a reducing sugar solution to determine the concentration of reducing sugar p...
