CIE IGCSE Biology: 复习笔记：6.1.2 Chlorophyll
CIE IGCSE Biology: 复习笔记：6.1.2 Chlorophyll Chlorophyll Chlorophyll is a green pigment that is found in chloroplasts within plant cells It is this pigment which gives plants their characteristic...
CIE IGCSE Biology: 复习笔记：6.1.1 Photosynthesis
CIE IGCSE Biology: 复习笔记：6.1.1 Photosynthesis Photosynthesis Green plants make the carbohydrate glucose from the raw materials carbon dioxide and water At the same time oxygen is ...
OCR A Level Biology:复习笔记2.5.2 Membrane Structure & Permeability
Factors Affecting Membrane Structure & Permeability The permeability of cell membranes is affected by different factors or conditions, such as: Temperature Solvent concentration Temperat...
CIE IGCSE Biology: 复习笔记：5.1.5 Enzymes & pH: Extended
CIE IGCSE Biology: 复习笔记：5.1.5 Enzymes & pH: Extended Enzymes & pH: Extended The optimum pH for most enzymes is 7 but some that are produced in acidic conditions, such as the stomach, h...
OCR A Level Biology:复习笔记2.5.1 The Cell Surface Membrane
Roles of Membranes Membranes are vital structures found in all cells The cell surface membrane creates an enclosed space separating the internal cell environment from the external environment Intra...
2022-23CTB赛制和流程更新，火热报名组队中！
关注社科实践活动的家长和同学对CTB应该并不陌生。全球青年研究创新论坛CTB，由哈佛商学院和清华大学经管学院学者联合启动，旨在让中国青年心怀家国立足身边，提出原创本土解决方案，在世界舞台发声。 CTB 2022-2...
OCR A Level Biology:复习笔记2.4.9 Practical: Measuring Enzyme Activity
Practical: Measuring Enzyme Activity The progress of enzyme-catalysed reactions can be investigated by: Measuring the rate of formation of a product Measuring the rate of disappearance of a substra...
OCR A Level Biology:复习笔记2.4.8 Coenzymes, Cofactors & Prosthetic Groups
Coenzymes, Cofactors & Prosthetic Groups There are substances other than substrates and inhibitors that interact with enzymes Some enzymes can only function properly if another non-protein subs...
OCR A Level Biology:复习笔记2.4.7 Enzyme Activity: Enzyme Inhibitors
Enzyme Inhibitors Reversible inhibitors An enzyme's activity can be reduced or stopped, temporarily, by a reversible inhibitor There are two types of reversible inhibitors: Competitive inhibitors h...
OCR A Level Biology:复习笔记2.4.6 Enzyme Activity: Substrate Concentration
Enzyme Activity: Substrate Concentration The greater the substrate concentration, the higher the rate of reaction: As the number of substrate molecules increases, the likelihood of enzyme-substrate...
OCR A Level Biology:复习笔记2.4.5 Enzyme Activity: Enzyme Concentration
Enzyme Activity: Enzyme Concentration Enzyme concentration affects the rate of reaction The higher the enzyme concentration in a reaction mixture, the greater the number of active sites available a...
OCR A Level Biology:复习笔记2.4.4 Enzyme Activity: Temperature
Enzyme Activity: Temperature Enzymes have a specific optimum temperature This is the temperature at which they catalyse a reaction at the maximum rate Lower temperatures either prevent react...
