AQA A Level Biology复习笔记5.4.1 Nutrient Cycles
Nutrient Cycles Living organisms require nutrients from their environments for growth and other processes (e.g. reproduction) These nutrients are then returned to the environment when organisms pro...
AQA A Level Biology复习笔记5.3.1 Primary Producers
Plants are Primary Producers An ecosystem in a particular area includes: All the living components (i.e. biotic factors such as organisms and their interactions) All the non-living components (i.e....
AQA A Level Biology复习笔记5.2.1 Mitochondria & the Need for Energy
Structure & Function of the Mitochondria Mitochondria are rod-shaped organelles 0.5 - 1.0 µm in diameter They are the site of aerobic respiration in eukaryotic cells The function of mitochondri...
AQA A Level Biology复习笔记5.1.1 Chloroplast Structures & their Functions
Chloroplast Structures & their Functions Chloroplasts are the organelles in plant cells where photosynthesis occurs Each chloroplast is surrounded by a double-membrane envelope Each of the enve...
AQA A Level Biology复习笔记4.6.1 Biodiversity Within a Community
Biodiversity Biodiversity can be thought of as a study of all the variation that exists within and between all forms of life Biodiversity looks at the range and variety of genes, species and habita...
AQA A Level Biology复习笔记4.5.1 Courtship
Courtship Organisms belong to the same species if they interbreed in their natural habitat to produce fertile offspring The process of successful interbreeding or mating is preceded by some form of...
AQA A Level Biology复习笔记4.4.1 Genetic Diversity
Genetic Diversity Organisms of the same species have very similar genomes, but two individuals (even twins) will have differences between their DNA base sequences Considering the size of genomes, t...
AQA A Level Biology复习笔记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复习笔记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...
