Edexcel IGCSE Maths复习笔记 1.5.1 Surds - Basics
Edexcel IGCSE Maths复习笔记 1.5.1 Surds - Basics What is a surd? A surd is the square root of a non-square integer What can we do with surds? 1. Multiplying surds – you can multiply numbers under s...
AQA A Level Biology复习笔记2.6.1 Vaccines
Vaccines A vaccine is a suspension of antigens that are intentionally put into the body to induce artificial active immunity. A specific immune response where antibodies are released by plasma cell...
AQA A Level Biology复习笔记2.5.1 Cell Recognition
Cell Recognition Our bodies have several defence mechanisms against pathogens. These include: Preventing the entry of pathogens by a variety of physical and chemical defences, such as the skin, muc...
AQA A Level Biology复习笔记2.4.1 The Structure of Cell Membranes
The Fluid Mosaic Model of Membranes Membranes are vital structures found in all cells The cell surface membrane creates an enclosed space separating the internal cell environment from the external ...
Edexcel IGCSE Maths复习笔记 1.4.2 Roots & Indices - Harder
Edexcel IGCSE Maths复习笔记 1.4.2 Roots & Indices - Harder What are indices? An Index (plural = indices) is just a power that a number (called the base) is raised to: Laws of indices – what you...
AQA A Level Biology复习笔记2.3.1 Interphase
Interphase Within multicellular organisms, not all cells retain the ability to divide Eukaryotic cells that do retain the ability to divide show a cell cycle Mitosis is part of a precisely controll...
Edexcel IGCSE Maths复习笔记 1.4.1 Roots & Indices - Basics
What are indices? An Index (plural = indices) is just a power that a number (called the base) is raised to: Laws of indices – what you need to know There are lots of very important laws (or ...
AQA A Level Biology复习笔记2.2.1 Methods of studying cells
The Principles & Limitations of Microscopy Microscopes can be used to analyse cell components and observe organelles Magnification and resolution are two scientific terms that are very importan...
AQA A Level Biology复习笔记2.1.1 The Cell Theory
The Cell Theory Until microscopes became powerful enough to view individual cells, no-one knew for certain what living organisms were made from A scientist called Robert Hooke is thought to be the ...
