AQA A Level Biology复习笔记2.4.5 Osmosis
The Process of Osmosis All cells are surrounded by a cell membrane which is partially permeable Water can move in and out of cells by osmosis Osmosis is the diffusion of water molecules from...
AQA A Level Biology复习笔记2.4.4 Diffusion
Diffusion & Facilitated Diffusion Diffusion is a type of transportation that occurs across the cell membrane It can be defined as: The net movement, as a result of the random motion of i...
AQA A Level Biology复习笔记2.4.3 The Cell Surface Membrane
Cell Surface Membranes Phospholipids Form the basic structure of the membrane (phospholipid bilayer) The tails form a hydrophobic core comprising the innermost part of both the outer and inn...
AQA A Level Biology复习笔记2.4.2 Components of Cell Surface Membranes
Phospholipids, Cholesterol, Glycolipids, Proteins & Glycoproteins The cell membranes of all organisms generally have a similar structure Cell membranes contain several different types of...
AQA A Level Biology复习笔记2.3.9 Viral Particle Replication
Viruses Do Not Undergo Cell Division Viruses are non-cellular infectious particles that straddle the boundary between ‘living’ and ‘non-living’ They are much smaller than prokaryotic cells T...
AQA A Level Biology复习笔记2.3.8 Binary Fission DOWNLOAD PDF
Binary Fission of Prokaryotic Cells The process of cell division (binary fission) in prokaryotic cells is much simpler than mitosis in eukaryotic cells Prokaryotic cells do not possess: A nu...
AQA A Level Biology复习笔记2.3.7 Uncontrolled Cell Division & Cancer
Uncontrolled Cell Division & Cancer Cancers demonstrate how important it is that cell division is precisely controlled, as cancers arise due to uncontrolled mitosis Cancerous cells divid...
AQA A Level Biology复习笔记2.3.6 Investigating Plant Root Tips
Maths Skill: Mitotic Index The mitotic index is the proportion of cells (in a group of cells or a sample of tissue) that are undergoing mitosis The mitotic index can be calculated using the ...
AQA A Level Biology复习笔记2.3.5 Recognising the Stages of Mitosis
Recognising the Stages of Mitosis from Images Cells undergoing different stages of the cell cycle can be identified using photomicrographs taken from microscope slides Cells undergoing certa...
AQA A Level Biology复习笔记2.3.4 Cytokinesis
Cytokinesis Cytokinesis Although not regarded as a phase of mitosis, cytokinesis is an important final step in the cell cycle because during this stage the cytoplasm is divides forming two g...
AQA A Level Biology复习笔记2.3.3 The Stages of Mitosis
Mitosis: The Stages Mitosis is the process of nuclear division by which two genetically identical daughter nuclei are produced that are also genetically identical to the parent cell nucleus ...
AQA A Level Biology复习笔记2.3.2 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...
