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...
Edexcel IGCSE Maths 复习笔记 2.3.3 Expanding Three Brackets
Edexcel IGCSE Maths 复习笔记 2.3.3 Expanding Three Brackets Expanding three brackets We’re still following the basic principle of expanding here – get rid of the brackets by multiplying out We just...
AQA A Level Biology复习笔记1.5.3 The Structure of DNA
The Structure of DNA The nucleic acid DNA is a polynucleotide – it is made up of many nucleotides bonded together in a long chain A DNA nucleotide DNA molecules are made up of two pol...
AQA A Level Biology复习笔记1.5.2 Nucleotide Structure & the Phosphodiester Bond
Nucleotide Structure & the Phosphodiester Bond Both DNA and RNA are polymers that are made up of many repeating units called nucleotides Each nucleotide is formed from: A pentose sugar (...
2022年5门AP成绩提前曝光！7月5日正式放分，5分率最低的科目是哪个？
大家都知道今年AP成绩的正式放榜时间是7月5日，但是这两天AP考试中心的副总裁特雷弗·帕克（Trevor Packer），突然连夜在社交平台上陆续发布了2022年的AP成绩的5分率数据！ 这份数据包括了五门科目的成绩，分别为...
AQA A Level Biology复习笔记1.4.14 Practical Skill: Controlling Variables & Calculating Uncertainty
Practical Skill: Control of Variables & Uncertainty Enzyme rate experiments are experiments that are carried out to determine the effect of changing a particular factor on the rate of a ...
AQA A Level Biology复习笔记1.4.13 Models & Functions of Enzyme Action
Students should be able to: Appreciate the Models & Functions of Enzyme Action Models of enzyme action Scientists often use models to explain their observations from experiments As techn...
Edexcel IGCSE Maths 复习笔记 2.3.2 Expanding Two Brackets - Harder
Edexcel IGCSE Maths 复习笔记 2.3.2 Expanding Two Brackets - Harder Hidden FOIL (aka spot the hidden brackets) Always write (a + b)2 as (a + b)(a + b) Beware of minus signs Remember the basic rules:...
AQA A Level Biology复习笔记1.4.12 Limiting Factors Affecting Enzymes: Inhibitors
Enzyme Inhibitors An enzyme's activity can be reduced or stopped, temporarily, by a reversible inhibitor There are two types of reversible inhibitors: Competitive inhibitors have a similar s...
AQA A Level Biology复习笔记1.4.11 Limiting Factors Affecting Enzymes: Substrate Concentration
Rate: Substrate Concentration The greater the substrate concentration, the higher the rate of reaction: As the number of substrate molecules increases, the likelihood of enzyme-substrate com...
AQA A Level Biology复习笔记1.4.10 Limiting Factors Affecting Enzymes: Enzyme Concentration
Rate: Enzyme Concentration Enzyme concentration affects the rate of reaction The higher the enzyme concentration in a reaction mixture, the greater the number of active sites available and the grea...
AQA A Level Biology复习笔记1.4.9 Maths Skill: Calculating pH
Maths Skill: Calculating pH If the hydrogen ion (H+) concentration of a solution is known, the pH can be calculated using the equation: pH = -log₁₀ [H⁺] You can find the ‘log’ function on yo...
