AQA A Level Biology復習筆記4.3.1 Genetic Mutations
Genetic Mutations A?gene mutation?is a change in the sequence of base pairs in a DNA molecule that may result in an altered polypeptide Mutations occur?continuously As the DNA base sequence determi...
AQA A Level Biology復習筆記4.2.1 The Genome
The Genome A gene is a length of DNA that codes for a polypeptide/protein A?genome?is the complete set of?genes?present in a cell The full genome is present within every cell of an organism, but no...
AQA A Level Biology復習筆記4.1.1 Prokaryotic DNA
DNA in Prokaryotes The DNA in prokaryotic cells is significantly different from the DNA found in eukaryotic cells “Prokaryote” means “before the nucleus” The DNA is double-stranded Prokaryotes poss...
AQA A Level Biology復習筆記3.6.1 Water Transport in the Xylem
Water & Mineral Ion Transport: Pathways & Mechanisms Within a plant?mineral ions?and?organic compounds?(eg. sucrose) are transported by being?dissolved in water. The?dissolved mineral ions?...
AQA A Level Biology復習筆記3.5.1 Mammalian Circulation
Blood Circulation in Mammals The need for a circulatory system The cells of all living organisms need a constant supply of?reactants for metabolism, e.g. oxygen and glucose Single celled organisms ...
AQA A Level Biology復習筆記3.4.1 Features of Mass Transport
Mass Transport The need for a circulatory system The cells of all living organisms need a constant supply of?reactants for metabolism, e.g. oxygen and glucose Single celled organisms can gain oxyge...
AQA A Level Biology復習筆記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復習筆記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復習筆記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...
