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What is involved in active transport?

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 moving su...
CS
Answered by Charlotte S. • Biology tutor
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Most cases of scarlet fever occur in children. Adults have usually developed immunity to a toxin that the Streptococcus bacteria produce during infection. Explain how an adult develops immunity to the toxin.

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 production ...
GS
Answered by Georgia S. • Biology tutor
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Compare the advantages and disadvantages of light and electron microscopes.

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 be u...
TD
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What are the basic life processes an organism must carry out to sustain life?

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 chemical...
WQ
Answered by Wesley Q. • Biology tutor
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What is diffusion?

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 there ...
RJ
Answered by Rhiannon J. • Biology tutor
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