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...
OCR A Level Biology:复习笔记1.2.9 Practical: Factors Affecting Membrane Structure & Permeability
Practical: Factors Affecting Membrane Structure & Permeability The permeability of cell membranes is affected by different factors or conditions, such as: Temperature Solvent concentration &nbs...
OCR A Level Biology:复习笔记1.2.8 Practical: Investigating Water Potential
Practical: Investigating Water Potential Practical 1: Investigating water potential using potato cylinders It is possible to investigate the effects of immersing plant tissue in solutions of differ...
OCR A Level Biology:复习笔记1.2.7 Practical: Investigating the Rate of Diffusion
Practical: Investigating the Rate of Diffusion Recording a range of quantitative measurements It is important to use appropriate apparatus when recording a range of quantitative measurements Quanti...
OCR A Level Biology:复习笔记1.2.6 Practical: Data loggers & Computer Modelling
Practical: Data loggers & Computer Modelling Data loggers Dataloggers are a tool that allows for the quick and efficient gathering of data This technology can be used for simple data collection...
