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...
美国计算机奥赛USACO 2021-2022赛季回顾，USACO课程助力新赛季备赛！
对于喜欢计算机的同学们来说，USACO受到斯坦福、MIT、卡梅等美国大学的高度认可，可谓强势提升自己背景的好活动之一！ 作为一个升级类赛事，大多数参赛同学的目标肯定不止一次晋级。因此早早准备起来才是上策！ ...
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...
