AQA A Level Biology復(fù)習(xí)筆記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復(fù)習(xí)筆記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復(fù)習(xí)筆記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復(fù)習(xí)筆記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復(fù)習(xí)筆記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復(fù)習(xí)筆記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?...
AQA A Level Biology復(fù)習(xí)筆記1.6.1 The Structure of ATP
The Structure of ATP All organisms require a constant supply of energy to maintain their cells and stay alive This energy is required: In anabolic reactions – building larger molecules from ...
AQA A Level Biology復(fù)習(xí)筆記1.5.1 The Function of DNA & RNA
The Function of DNA & RNA Deoxyribonucleic acid?(DNA) and?ribonucleic acid?(RNA) are both types of?nucleic acid DNA and RNA are both?found in all living cells DNA and RNA are both needed to?bui...
AQA A LEVEL BIOLOGY復(fù)習(xí)筆記1.4.1 Many Proteins are Enzymes
Enzymes as Proteins Enzymes are?biological catalysts ‘Biological’ because they function in?living systems ‘Catalysts’ because they?speed up the rate of chemical reactions?without being used up or c...
