AQA A Level Biology复习笔记8.2.7 Epigenetics
Epigenetics DNA is wrapped around histone proteins which form a nucleosome. Nucleosomes coil tightly around each other to form the chromosome structure. In eukaryotic cells, th...
AQA A Level Biology复习笔记8.2.6 Evaluating Data about Genetic Expression
Interpret & Evaluate Data about Genetic Expression RNA analysis RNA analysis is important with regards to gene expression From the outside, most cells look almost identical with the same...
AQA A Level Biology复习笔记8.2.5 Regulation of Transcription
Transcription Factors Eukaryotes use transcription factors to control gene expression A transcription factor is a protein that controls the transcription of genes by binding to a specific re...
AQA A Level Biology复习笔记8.2.4 Producing Tissue Cultures of Explants
Apparatus & Techniques: Producing Tissue Cultures from Cauliflower Explants Creating clones of cauliflowers is used to demonstrate totipotency through the production of tissue culture Ca...
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...
