AQA A Level Biology复习笔记8.2.3 The Use of Stem Cells
Evaluating the Use of Stem Cells Use of embryonic stem cells Due to their ability to differentiate into multiple cell types, stem cells have huge potential in the therapeutic treatment of di...
AQA A Level Biology复习笔记8.2.2 Stem Cells
Pluripotent & Unipotent Cells Pluripotent embryonic stem cells Pluripotent stem cells are embryonic stem cells that can differentiate into any cell type found in an embryo but are not ab...
AQA A Level Biology复习笔记8.1.2 The Effect of Genetic Mutations
The Effect of Genetic Mutations Mutations occur spontaneously and randomly during DNA replication As the DNA base sequence determines the sequence of amino acids that make up a protein, muta...
AQA A Level Biology复习笔记7.4.9 Investigating Species Distribution
Required Practical: Investigating Factors Affecting Species Distribution Understanding how to investigate the effects of named environmental factors on the distribution of a given species is an imp...
AQA A Level Biology复习笔记7.4.8 Conservation & Human Need
Conservation & Human Need Humans use many resources from the Earth such as land (for settlements and agriculture), water, wood and fossil fuels As the human population increases and coun...
AQA A Level Biology复习笔记7.4.7 Growth Rate of Microorganisms
Apparatus & Techniques: Investigating Growth Rate Using Turbitity Measurements The population growth rate of microorganisms, such as bacteria or yeast, can be investigated by growing the...
AQA A Level Biology复习笔记7.4.6 Succession
Primary Succession Ecosystems are dynamic, meaning that they are constantly changing Sometimes, ecosystems change from being very simple to being relatively complex This process is known as ...
AQA A Level Biology复习笔记7.4.5 Ecosystems
Ecosystems are Dynamic Ecosystems Species do not exist by themselves in their own isolated environment, they interact with other species forming a community The species within a community in...
AQA A Level Biology复习笔记7.4.4 Estimating the Size of a Population
Estimating the Size of a Population Measuring all the different levels of biodiversity within an ecosystem could be very time consuming Finding out which species live in an ecosystem and the...
