CIE A Level Biology复习笔记5.1.6 How Tumours Form
How a Tumour Forms Cancers demonstrate how important it is that cell division is precisely controlled, as cancers arise due to uncontrolled mitosis Cancerous cells divide repeatedly and uncontrolla...
CIE A Level Biology复习笔记5.1.5 The Role of Stem Cells
The Significance of Stem Cells A stem cell is a cell that can divide (by mitosis) an unlimited number of times Each new cell (produced when a stem cell divides) has the potential to remain a stem c...
CIE A Level Biology复习笔记5.1.4 The Role of Telomeres
The Significance of Telomeres The ends of the chromatids in chromosomes are ‘sealed’ with protective structures called telomeres They are made of non-coding DNA (DNA that does not contain genes) th...
CIE A Level Biology复习笔记5.1.3 The Cell Cycle
The Cell Cycle Mitosis is part of a precisely controlled process known as the cell cycle The cell cycle is the regulated sequence of events that occurs between one cell division and the next The ce...
CIE A Level Biology复习笔记5.1.2 Mitosis
The Importance of Mitosis Mitosis is the process of nuclear division by which two genetically identical daughter nuclei are produced that are also genetically identical to the parent nucleus The pr...
CIE A Level Biology复习笔记5.1.1 Chromosome Structure
Chromosome Structure Chromosomes are made of one very long, condensed DNA molecule associated with proteins (in eukaryotic cells) The main proteins present are the large positively charged globular...
CIE A Level Biology复习笔记4.2.12 Comparing Osmosis in Plants & Animals
Osmosis in Cells: Comparison Comparing & Contrasting the Movement of Water by Osmosis in Plant & Animal Cells Table 转载自savemyexams
CIE A Level Biology复习笔记4.2.11 Osmosis in Animals
Osmosis: Animal Cells Osmosis is the net movement of water molecules from a region of higher water potential (dilute solution) to a region of lower water potential (concentrated solution), through ...
CIE A Level Biology复习笔记4.2.10 Osmosis in Plant Cells
Osmosis: Plant Cells Osmosis is the net movement of water molecules from a region of higher water potential (dilute solution) to a region of lower water potential (concentrated solution), through a...
CIE A Level Biology复习笔记4.2.9 Estimating Water Potential in Plants
Estimating Water Potential in Plant Tissue It is possible to investigate the effects of immersing plant tissue in solutions of different water potentials and then use the results to estimate the wa...
CIE A Level Biology复习笔记4.2.8 Investigating Surface Area
Investigating SA with Agar The effect of changing surface area to volume ratio on diffusion can be investigated by timing the diffusion of ions through cubes of agar of different sizes Method Colou...
CIE A Level Biology复习笔记4.2.7 Surface Area to Volume Ratios
Principles of SA:V Surface area and volume are both very important factors in the exchange of materials in organisms The surface area refers to the total area of the organism that is exposed to the...
