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How does an atheroma increase the risk of death?

An atheroma is defined as fatty material in the wall of an artery. This increases the risk of a blood clot forming in the artery. If a blood clot forms in a coronary artery, which supplies the heart muscle, ...
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Answered by Melissa T. • Biology tutor
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Compare and contrast the structures of fibrous and globular proteins.

The crucial thing with a "compare and contrast" question is that you have to give both similarities and differences to get full marks. Firstly, both of these proteins are chains of amino acids join...
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Answered by Oscar B. • Biology tutor
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Explain how the human body is adapted for gas exchange

Gas exchange occurs in the lungs where oxygen enters from the air and diffuses into the blood stream and carbon dioxide in moves the opposite direction. Oxygen is needed for respiration by the body, for exam...
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Answered by Louise A. • Biology tutor
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A wheat farmer uses fertiliser on his crop for several months. During this time the pond at the end of the field becomes covered in a thin green film and starts to smell. What process is responsible for this and how does it occur?

Fertilisers contain nitrates for use by plants for protein synthesis.In eutrophication, when it rains excess soil nitrates are washed in run-off to the pond. Water becomes nitrogen rich so surface algae thri...
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Describe the events that modulate the release of insulin in beta cells. (4)

This is a describe question - it should be answered directly with only the appropriate factual information. Glucose enters the beta cells via specific glucose transporters embedded in the cell membrane (GLUT...
Answered by • Biology tutor
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