Download Cambridge IGCSE Biology by D. G. Mackean, Dave Hayward PDF

By D. G. Mackean, Dave Hayward

Counseled by way of Cambridge overseas Examinations. The bestselling name, constructed through foreign specialists - now up to date to supply accomplished assurance of the center and prolonged themes within the most recent syllabus. - contains a student's CD-ROM that includes interactive checks and perform for all exam papers - Covers the middle and complement sections of the up to date syllabus - Supported via the main finished variety of extra fabric, together with instructor assets, Laboratory Books, perform Books and Revision courses - Written by means of popular, specialist authors with enormous adventure of training and reading overseas skills

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Diffusion Key definition Diffusion is the net movement of molecules and ions from a region of their higher concentration to a region of their lower concentration down a concentration gradient, as a result of their random movement. The molecules of a gas such as oxygen are moving about all the time. So are the molecules of a liquid or a substance such as sugar dissolved in water. 1). 1 become evenly distributed Diffusion This process is called diffusion. e. e. 2 (b) concentrations equal on both sides of the cell membrane Molecules entering a cell by diffusion Whether this will happen or not depends on whether the cell membrane will let the molecules through.

So are the molecules of a liquid or a substance such as sugar dissolved in water. 1). 1 become evenly distributed Diffusion This process is called diffusion. e. e. 2 (b) concentrations equal on both sides of the cell membrane Molecules entering a cell by diffusion Whether this will happen or not depends on whether the cell membrane will let the molecules through. Small molecules such as water (H2O), carbon dioxide (CO2) and oxygen (O2) can pass through the cell membrane fairly easily. So diffusion tends to equalise the concentration of these molecules inside and outside the cell all the time.

Hundreds of cell groups like this would form a gland like the salivary gland. indd 32 8/18/14 9:40 PM Size of specimens Organisms An organism is formed by the organs and systems working together to produce an independent plant or animal. 16. 16 An example of how cells, tissues and organs are related ●● Size of specimens The light microscope Most cells cannot be seen with the naked eye. A hand lens has a magnification of up to ×20, but this is not sufficient to observe the detail in cells. 17) has two convex lenses, providing magnifications of up to ×1500, although most found in school laboratories will only magnify to ×400.

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