Edexcel IGCSE Biology: Double Science 复习笔记 2.3.4 Practical: Enzymes & Temperature Practical: Enzymes & Temperature Amylase is an enzyme that digests?starch?(a polysaccharide of g...
Edexcel IGCSE Biology: Double Science 复习笔记 2.3.3 Enzymes Enzymes as Biological Catalysts Enzymes Enzymes are proteins that act as?biological catalysts?to?speed up?the rate of a chemical ...
Activity & The Decay Constant Since radioactive decay is?spontaneous?and?random, it is useful to consider the average number of nuclei which are expected to decay per unit time This is known as...
Edexcel IGCSE Biology: Double Science 复习笔记 2.3.2 Practical: Food Tests Practical: Food Tests Preparing a sample Before you can carry out any of the food tests described below, you may ne...
Edexcel IGCSE Biology: Double Science 复习笔记 2.3.1 Carbohydrates, Fats & Proteins Chemical Elements Most of the molecules in living organisms fall into three categories:?carbohydrates,...
Edexcel IGCSE Biology: Double Science 复习笔记 2.2.2 Specialised Cells Cell Differentiation & Specialised Cells The?structural differences?between different types of cells enables them t...
The Random Nature of Nuclear Decay Radioactive decay is defined as: The spontaneous disintegration of a nucleus to form a more stable nucleus, resulting in the emission of an alpha, beta or gamma p...
Edexcel IGCSE Biology: Double Science 复习笔记 2.2.1 Cell Structure Cell Structures Eukaryotic cells have?subcellular structures?contained within their cytoplasm Each cellular structure carr...
Core Practical 15: Investigating Gamma Radiation Absorption Aim of the Experiment To investigate the absorption of gamma rays by different thicknesses of lead Variables: Independent variable?= Thic...
