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What is a mutation and what are the consequences of one?

A mutation is a change in the genetic composition of the DNA. It is often caused by an accidental insertion, deletion or swapping of a single base however whole genes can also move. SNPs, or single nucleotid...
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Answered by Liam M. • Biology tutor
4829 Views

How does air enter the lungs for inspiration? What does the body do to make this happen?

Intercostal muscles and the diapragm contract, which causes the ribs to move upwards and outwards. This increases the volume of the thorax, therefore lowering the pressure within the lungs. The pressure of t...
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Answered by Isobel R. • Biology tutor
6681 Views

What is the myelin sheath?

The myelin sheath is a layer of insulating, fatty material that encases some neurones. The sheath is composed of Schwann cells that have gaps called nodes of Ranvier between them. Potassium and sodium ions c...
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Answered by Alice H. • Biology tutor
5434 Views

What are the methods of immobilising enzymes?

There are four methods of enzyme immobilisation: adsorption, covalent bonding, entrapment and membrane separation. Adsorption involves mixing the enyzme with an immobilsing support so the enzyme molecules wi...
AH
Answered by Alice H. • Biology tutor
37072 Views

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
123974 Views