AQA A Level Biology复习笔记4.4.1 Genetic Diversity
Genetic Diversity Organisms of the same species have very similar genomes, but two individuals (even twins) will have differences between their DNA base sequences Considering the size of genomes, t...
AQA A Level Biology复习笔记4.3.1 Genetic Mutations
Genetic Mutations A gene mutation is a change in the sequence of base pairs in a DNA molecule that may result in an altered polypeptide Mutations occur continuously As the DNA base sequence determi...
AQA A Level Biology复习笔记4.2.1 The Genome
The Genome A gene is a length of DNA that codes for a polypeptide/protein A genome is the complete set of genes present in a cell The full genome is present within every cell of an organism, but no...
AQA A Level Biology复习笔记4.1.1 Prokaryotic DNA
DNA in Prokaryotes The DNA in prokaryotic cells is significantly different from the DNA found in eukaryotic cells “Prokaryote” means “before the nucleus” The DNA is double-stranded Prokaryotes poss...
AQA A Level Biology复习笔记3.6.1 Water Transport in the Xylem
Water & Mineral Ion Transport: Pathways & Mechanisms Within a plant mineral ions and organic compounds (eg. sucrose) are transported by being dissolved in water. The dissolved mineral ions ...
开放式课程是什么？有哪些美国大学提供了开放式课程体系？
申请大学前，大家会结合很多因素来做综合考虑，大学课程的灵活性也是其中一项指标。 有些同学在选专业时非常纠结，虽然喜欢这个专业，但担心某一门必修课成为自己的短板。如何才能让这些学生在自己擅长的领域崭露...
AQA A Level Biology复习笔记3.5.1 Mammalian Circulation
Blood Circulation in Mammals The need for a circulatory system The cells of all living organisms need a constant supply of reactants for metabolism, e.g. oxygen and glucose Single celled organisms ...
Edexcel IGCSE Maths复习笔记 1.6.1 Set Notation & Venn Diagrams
Edexcel IGCSE Maths复习笔记 1.6.1 Set Notation & Venn Diagrams What do I need to know? You’ll be drawing Venn diagrams so make sure you are familiar with those first Notation ξ is the universal...
AQA A Level Biology复习笔记3.4.1 Features of Mass Transport
Mass Transport The need for a circulatory system The cells of all living organisms need a constant supply of reactants for metabolism, e.g. oxygen and glucose Single celled organisms can gain oxyge...
AQA A Level Biology复习笔记3.3.1 Digestion
The Process of Digestion Digestion is a process in which relatively large, insoluble biological molecules in food (such as starch, proteins) are hydrolysed into smaller, soluble molecules that can ...
AQA A Level Biology复习笔记3.2.1 The Human Gas Exchange System
The Human Gas Exchange System: Structure Gas exchange takes place in the human thorax. This is a collection of organs and tissues in the chest cavity The main structures of the human gas exc...
Edexcel IGCSE Maths复习笔记 1.5.2 Surds - Rationalising Denominators
Edexcel IGCSE Maths复习笔记 1.5.2 Surds - Rationalising Denominators What is a surd? A surd is the square root of a non-square integer How do we rationalise the denominator of a surd? Worked Exampl...
