OCR A Level Biology:复习笔记2.6.1 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...
OCR A Level Biology:复习笔记2.5.9 Practical: Investigating Water Potential
Practical: Investigating Water Potential Practical 1: Investigating water potential using potato cylinders It is possible to investigate the effects of immersing plant tissue in solutions of differ...
OCR A Level Biology:复习笔记2.5.8 Osmosis in Animal & Plant Cells
Osmosis in Animal & Plant Cells Osmosis in animal cells Animal cells can lose and gain water as a result of osmosis As animal cells do not have a supporting cell wall (unlike plant cells), the ...
OCR A Level Biology:复习笔记2.5.7 Osmosis
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 a dilute solution to ...
OCR A Level Biology:复习笔记2.5.6 Endocytosis & Exocytosis
Endocytosis & Exocytosis The processes of diffusion, osmosis and active transport are responsible for the transport of individual molecules or ions across cell membranes However, the bulk trans...
OCR A Level Biology:复习笔记2.5.5 Active Transport
Active Transport Active transport is the movement of molecules and ions through a cell membrane from a region of lower concentration to a region of higher concentration using energy from respiratio...
OCR A Level Biology:复习笔记2.5.4 Practical: Investigating the Rate of Diffusion
Practical: Investigating the Rate of Diffusion It is possible to investigate the effect of certain factors on the rate of diffusion Different apparatus can be used to do this, such as Visking tubin...
OCR A Level Biology:复习笔记2.5.3 Diffusion & Facilitated 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 its mole...
OCR A Level Biology:复习笔记2.5.2 Membrane Structure & Permeability
Factors Affecting Membrane Structure & Permeability The permeability of cell membranes is affected by different factors or conditions, such as: Temperature Solvent concentration Temperat...
