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What is meant by the semi-conservative replication of DNA?

Semi-conservative replication means that during DNA replication, the two strands of nucleotides separate. Both strands then form the template for free nucleotides to bind to to create the two identical daugh...
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Answered by David H. • Biology tutor
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How to write an essay which will get me top marks in my exam

Essays in biology? Right I wasnt the only surprised one when I first heard about it. The main concept is that these essay titles are diverse and can range from a whole multitude of topics. But why is my essa...
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Answered by Bilal R. • Biology tutor
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How is an action potential fired?

When a neurone is at rest, the outside of the neurone is more positive than the inside. This is due to the sodium-potassium pump which actively pumps 3 Na+ outside the cell, whilst at the same time pumping 2...
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Answered by Eleanor B. • Biology tutor
4860 Views

Explain how type 1 diabetes occurs

Type 1 diabetes occurs when the immune system to fails to identify a group of cells in the pancreas called the beta islet of Langerhans cells as 'self' cells. This means that they are recognised as 'foreign'...
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Answered by Emma R. • Biology tutor
4392 Views

What is a mutation and what are they caused by?

A mutation is a change in the base sequence of DNA. A mutation can be caused by a mistake during replication of DNA or by mutagenic agents. Mutagenic agents include chemicals that can act as bases or radiati...
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Answered by Nadine K. • Biology tutor
4693 Views