Edexcel IGCSE Biology 复习笔记 2.8.1 The Requirement for Transport Systems Unicellular Organisms In order for any organism to function properly, it needs to exchange substances, such as food...
Sequencing DNA to Determine Protein Sequences The genome of simpler organisms can be used to obtain the proteome (the sequences of the proteins) of the organism This information can be used ...
Tumour Development Cancers demonstrate how important it is that cell division is precisely controlled, as cancers arise due to uncontrolled mitosis Cancerous cells divide repeatedly and unco...
Edexcel IGCSE Biology 复习笔记 2.7.7 Practical: The Effect of Exercise on Breathing Practical: The Effect of Exercise on Breathing Exercise causes the frequency of breathing to increase in o...
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 ...
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...
Edexcel IGCSE Biology 复习笔记 2.7.6 Smoking & the Human Gas Exchange System Smoking & the Gas Exchange System Smoking causes chronic obstructive lung disease (COPD), coronary heart ...
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 ...
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...
