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Biology
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What is a synapse and how does it work?

A synapse is a small gap between neurones (nerve cells). Information is passed along the neurone as an electrical impulse, but to get from one neurone to the next, the information is converted into a chem...

RL
Answered by Rhiannon L. Biology tutor
4642 Views

Explain how proteins act as enzymes, including control by feedback inhibition in allosteric enzymes [9 marks]

The following answers this past exam question. Test your understanding by defining all the CAPITALISED words. Enzymes are GLOBULAR PROTEINS, which contain an active site to which the substrate binds. The ...

PS
Answered by Paulien S. Biology tutor
6919 Views

Why is oxygen needed in respiration?

In respiration, as you know the electrons travel through the electron transport chain and provide the energy to pump Hydrogen ions across the inner membrane. Once they reach the end of the chain, where do...

EJ
Answered by Emma J. Biology tutor
14687 Views

Describe three differences between a motor neurone and a sensory neurone.

A motor neurone has no or a very short dendron whereas a sensory neurone has a long dendron. A sensory neurone's cell body is found 'in the middle' of the neurone whereas a motor neurone's cell body is fo...

JD
Answered by Joshua D. Biology tutor
6293 Views

Define the term osmosis.

Osmosis is the net movement of water molecules from an area of high water potential to low water potential, commonly across a partially permeable membrane such as a cell's surface membrane.

JD
Answered by Joshua D. Biology tutor
2924 Views

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