AQA A Level Biology复习笔记3.2.4 Three-way Taps
Apparatus & Techniques: Three-way Taps Three-way taps can be used in conjunction with potometers and respirometers They allow for repeat readings to be taken easily, eliminating the need...
AQA A Level Biology复习笔记3.2.3 Looking at the Gas Exchange under the Microscope
Apparatus & Techniques: Using an Optical Microscope Many biological structures are too small to be seen by the naked eye Optical microscopes are an invaluable tool for scientists as they...
AQA A Level Biology复习笔记3.2.2 Dissecting the Gas Exchange System
Apparatus & Techniques: Dissection Dissections are a vital part of scientific research They allow for the internal structures of organs to be examined so that theories can be made about ...
AQA A Level Biology复习笔记3.1.6 Gas Exchange vs Water Loss
Compromises between Gas Exchange & Water Loss The exchange of gases from the atmosphere is essential for the survival of organisms Oxygen is required for respiration Carbon dioxide is re...
AQA A Level Biology复习笔记3.1.5 Adaptations of Gas Exchange Surfaces
Adaptations of Gas Exchange Surfaces Effective exchange surfaces in organisms have: A large surface area Short diffusion distance Concentration gradient (maintained) Across the Body S...
AQA A Level Biology复习笔记3.1.4 SA:V Ratio & Metabolic Rate
The Relationship between Surface Area: Volume Ratio & Metabolic Rate The metabolic rate of an organism is the amount of energy expended by that organism within a given period of time The...
AQA A Level Biology复习笔记3.1.3 Adaptation to Facilitate Exchange
Adaptations In Large Organisms to Facilitate Exchange Single-celled organisms have a high SA:V ratio which allows for the exchange of substances to occur via simple diffusion The large surfa...
AQA A Level Biology复习笔记3.1.2 Agar Blocks Practical
Practical Skill: Agar Blocks The effect of changing surface area to volume ratio on diffusion can be investigated by timing the diffusion of ions through cubes of agar of different sizes Met...
AQA A Level Biology复习笔记2.6.7 ELISA
ELISA Each clone of plasma cells produces only one type of antibody These are known as monoclonal antibodies Monoclonal antibodies can be used in medical diagnoses They can be used in...
