AQA A Level Biology复习笔记8.2.10 Two Types of Tumours
The Characteristics of Benign & Malignant Tumours Tumours are groups of abnormal cells that form lumps or growths They can start in any of the cells in our bodies Tumours have different ...
AQA A Level Biology复习笔记8.2.9 RNA Interference
RNA Interference RNA interference (RNAi) is a form of post-translational modification which occurs in the cytoplasm RNAi is sequence-specific silencing of gene expression and therefore can b...
AQA A Level Biology复习笔记8.2.8 Epigenetics & Disease
Epigenetics & Disease Inheritance of epigenetic modifications Epigenetic imprinting is the DNA methylation of certain genes and it occurs during the formation of oocytes and sperm cells ...
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...
