AQA A Level Biology复习笔记1.5.10 The Watson Crick Model
Evaluating the Watson-Crick Model Watson and Crick were two scientists who worked together to confirm the double-helix structure of DNA in 1953 Watson and Crick also came up with a model by ...
Edexcel IGCSE Maths 复习笔记 2.4.2 Factorising Quadratics - Harder
Edexcel IGCSE Maths 复习笔记 2.4.2 Factorising Quadratics - Harder What is a quadratic expression? A quadratic expression looks like this:ax2 + bx + c (as long as a ≠ 0) Note: If there are any high...
AQA A Level Biology复习笔记1.5.9 Calculating the Frequency of Nucleotide Bases
Maths Skill: Frequency of Bases All DNA nucleotides contain the same phosphate group and deoxyribose sugar. The nitrogenous base attached to the sugar can vary between nucleotides There are ...
AQA A Level Biology复习笔记 1.5.8 The Process of Semi-Conservative Replication
The Process of Semi-Conservative Replication DNA replication occurs in preparation for mitosis, when a parent cell divides to produce two genetically identical daughter cells – as each daugh...
AQA A Level Biology复习笔记 1.5.7 Semi-Conservative Replication
The Purpose of Semi-Conservative Replication Before a (parent) cell divides, it needs to copy the DNA contained within it This is so that the two new (daughter) cells produced will both rece...
Edexcel IGCSE Maths 复习笔记 2.4.1 Factorising Quadratics - Basics
Edexcel IGCSE Maths 复习笔记 2.4.1 Factorising Quadratics - Basics What is a quadratic expression? A quadratic expression looks like this:ax2 + bx + c (as long as a ≠ 0) Note: If there are any high...
AQA A Level Biology复习笔记 1.5.6 The Origins of Research on the Genetic Code
Appreciating How the Function of DNA Was Determined DNA was actually first observed in the 1800s by a Swiss scientist called Friedrich Miescher Miescher is credited with being the first pers...
AQA A Level Biology复习笔记 1.5.5 Ribosomes
Ribosomes Ribosomes are small organelles that are either free in the cytoplasm (of all cells) or are attached to the rough endoplasmic reticulum (only in eukaryotic cells) Ribosomes are the ...
AQA A Level Biology复习笔记1.5.4 The Structure of RNA
The Structure of RNA Like DNA, the nucleic acid RNA (ribonucleic acid) is a polynucleotide – it is made up of many nucleotides linked together in a chain Like DNA, RNA nucleotides contain th...
