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What changes happen in the chest to allow us to breath in and out?

Air always moves from an area of higher pressure to an area of lower pressure, an example of this is when there is a puncture in a tyre. The air in the tyre is at higher pressure than normal and so when the ...
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Answered by Benjamin G. • Biology tutor
3480 Views

What is the difference between a competitive and a non-competitive inhibitor?

Inhibitors are molecules that stop substrates from being able to bind to their enzymes, and therefore inhibit the action of specific enzymes. A competitive inhibitor is an inhibitor which has a similar shape...
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Answered by Sreya C. • Biology tutor
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A man has a disease caused by a dominant allele. The mother has the disease but the father does not, explain how we know the man is heterozygous for this disease.

So first we must gather the informaton, the disease is caused by a dominant allele, we may call this 'D', the recessive could therefore be 'd'. The mother has the disease, but the father does not. Therefore ...
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Answered by Lucas C. • Biology tutor
3545 Views

How are action potentials generated in a neuron?

A stimulus at the receptor end of the neuron causes the membrane to become more permeable to Na+ ions. Because there is a higher concentration of Na+ on the outside of the cell the flood into the cell down t...
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Answered by Alexander N. • Biology tutor
5408 Views

Suggest how the two sub-species have developed from a single ancestral population.

Two populations become separated by a barrier such as sea (geographical separation). As a result populations cannot interbreed, hence gene flow between two populations is prevented. As a consequence, only a ...
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Answered by Maja S. • Biology tutor
3391 Views