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...
AQA A Level Biology复习笔记3.1.1 Surface Area to Volume Ratio
Surface Area to Volume Ratio Surface area and volume are both very important factors in the exchange of materials in organisms The surface area refers to the total area of the organism that is expo...
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 ...
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...
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 ...
