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...
AQA A Level Biology复习笔记2.6.6 Ethical Issues with Vaccines & Monoclonal Antibodies
Ethical Issues with Vaccines & Monoclonal Antibodies Ethical issues associated with the use of vaccines Use of animals: All vaccines are tested on animals before they can move onto human...
AQA A Level Biology复习笔记2.6.5 Monoclonal Antibodies
Monoclonal Antibodies Diagnostic uses of monoclonal antibodies Monoclonal antibodies can be used diagnostically for: Pregnancy tests Diagnosing HIV Detecting the presence of pathogens such a...
AQA A Level Biology复习笔记2.6.4 AIDS
AIDS Symptoms of AIDS Immediately after infection with HIV people often suffer mild flu-like symptoms These symptoms pass and for a period of time infected people might not know they are inf...
