AQA A Level Biology復(fù)習筆記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復(fù)習筆記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復(fù)習筆記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復(fù)習筆記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復(fù)習筆記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復(fù)習筆記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復(fù)習筆記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復(fù)習筆記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復(fù)習筆記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...
