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In what ways have human activities contributed to global warming?

With this question it is important to focus on the human contribution to global warming rather than explaining why global warming is happening. Start your answer by explaining that carbon dioxide and methane...
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Answered by Kaat M. • Biology tutor
7150 Views

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
4747 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
6603 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
5362 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...
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Answered by Alice H. • Biology tutor
36854 Views