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Is all of a persons DNA used to create the body?

This is a common question. After learning about translation in A-level biology and the importance of converting DNA into proteins (the building block of organisms), students often assume that all DNA is used...
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Answered by Jemima S. • Biology tutor
2862 Views

What is a synapse and how does information pass across a synapse?

A synapse s a junction between two neurones. Neurotransmitters are relased from one neurone and diffuses across the synapse to stimulate the next neurone.
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Answered by Lucy O. • Biology tutor
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Explain the need for enzymes in digestion.

Enzymes increase the rate of digestion. At body temperature it would be too slow without them. Enzymes break down large insoluble molecules into small soluble molecules so that they can be absored into the b...
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Answered by Caroline O. • Biology tutor
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Describe how ventilation of the lungs occurs.

Ventilation is the process of moving air in and out of the lungs. This is brought about by pressure changes in the thoracic cavity. During inspiration, the diaphragm contracts causing it to flatten and move ...
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Answered by Emily S. • Biology tutor
4635 Views

How do fish take in oxygen from the enviroment?

The route of respiration for aquatic animals is via the gills. Oxygen absorption takes place as water, drawn in through the mouth is pushed out through the gill slits so flow is unidirectional (unlike mammal...
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Answered by Sarah D. • Biology tutor
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