Edexcel IGCSE Biology 复习笔记 2.9.3 The Urinary System
Edexcel IGCSE Biology 复习笔记 2.9.3 The Urinary System The Urinary System: Structure Two key functions of the urinary system are: To filter waste products from the blood and expel it from t...
Edexcel IGCSE Biology 复习笔记 2.9.2 Excretion in Humans
Edexcel IGCSE Biology 复习笔记 2.9.2 Excretion in Humans The Organs of Excretion Humans have organs that are specialised for the removal of certain excretory products Excretory organs of the...
Edexcel IGCSE Biology 复习笔记 2.9.1 Excretion
Edexcel IGCSE Biology 复习笔记 2.9.1 Excretion The Need for Excretion in Humans Many of the necessary metabolic reactions that take place within the cells of organisms produce waste products...
Edexcel IGCSE Biology 复习笔记 2.8.11 Blood Vessels & the Circulatory System
Edexcel IGCSE Biology 复习笔记 2.8.11 Blood Vessels & the Circulatory System Blood Vessels There are three main types of blood vessel: Arteries Veins Capillaries Smaller vessels t...
Edexcel IGCSE Biology 复习笔记 2.8.10 The Heart
Edexcel IGCSE Biology 复习笔记 2.8.10 The Heart Structure & Function of the Heart The heart organ is a double pump Oxygenated blood from the lungs enters the left side of the heart and i...
Edexcel IGCSE Biology 复习笔记 2.8.8 Human Transport Systems: White Blood Cells & Immunity
Edexcel IGCSE Biology 复习笔记 2.8.8 Human Transport Systems: White Blood Cells & Immunity White Blood Cells White blood cells are part of the body’s immune system These specialised cells defen...
AQA A Level Biology复习笔记8.4.13 Uses of Genetic Fingerprinting
Uses of Genetic Fingerprinting Polymerase chain reaction (PCR) is a common molecular biology technique used in most applications of gene technology, for example, DNA profiling (eg. identific...
Edexcel IGCSE Biology 复习笔记 2.8.7 Human Transport Systems: Platelets
Edexcel IGCSE Biology 复习笔记 2.8.7 Human Transport Systems: Platelets Platelets Platelets are involved in helping the blood clot Platelets are fragments of cells that are involved in blood...
AQA A Level Biology复习笔记8.4.12 Genetic Fingerprinting
Genetic Fingerprinting DNA can be collected from almost anywhere on the body, e.g. the root of a hair or saliva from a cup. After collection DNA must be prepared for gel electrophoresis so t...
AQA A Level Biology复习笔记8.4.11 Gel Electrophoresis
Apparatus & Techniques: Gel Electrophoresis Gel electrophoresis is a technique used widely in the analysis of DNA, RNA and proteins During electrophoresis the molecules are separated acc...
AQA A Level Biology复习笔记8.4.10 Variable Number Tandem Repeats
Variable Number Tandem Repeats Variable number tandem repeats (VNTRs) are regions found in the non-coding part of DNA A short DNA sequence (e.g. GATA) is repeated a variable number of times ...
AQA A Level Biology复习笔记8.4.9 Genetic Counselling & Personalised Medicine
Genetic Counselling & Personalised Medicine Genetic counselling Genetic screening can leave a patient or parent with many questions Genetic counsellors are commonly used to help individu...
