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This question comes up often in GCSE papers and is a key topic when talking about exchange or cell biology. 
Active transport comes hand in hand with diffusion and osmosis. It is a key mechanism for ...

Previous exposure to the toxin confers immunity by eliciting an immune response whereby b-cells differentiate into plasma cells allowing the production of antibodies. These will in turn stimulate producti...

Electron microscopes have higher magnification and higher resolution than light microscopes. Scanning electron microscopes can be used to examine the surface of cells and structuresLight microscopes can b...

M - movementmovement is required in any organism to allow it to access the environment and sources of energyR - respirationenergy producing processes underlie metabolism in the organism required for chemi...

Diffusion is the net movement of particles from an area of high concentration to an area of low concentration. This means that the particles of a substance move from where there is lots of it to where the...