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Biology
A Level

What is cancer?

For many reasons cell division can become unregulated. This leads to the formation of a mass of cells called a tumour which cannot perform their normal function – they are said to be undifferentiated. In ...

RA
Answered by Rohin A. • Biology tutor
4741 Views

In DNA, if you know the percentage of a base on 1 strand, how do you work out the bases on the opposite strand?

This questions requires knowledge of the base pairing in DNA, plus a little bit of maths! As you know, bases on the 2 DNA strands always pair in the same way: A (adenine) with T (thymine) , C (cytosine...

EB
Answered by Eleanor B. • Biology tutor
14168 Views

what are the differences between involuntary, cardiac and voluntary muscle?

Involuntary muscle (or smooth muscle) is innervated by the autonomic nervous system and therefore is not under conscious control. It is not st...

DE
Answered by Dani E. • Biology tutor
49844 Views

How are signals transmitted across the synaptic cleft?

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