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Describe how the coronary arteries can become narrowed and explain how this can lead to a heart attack.

Eating a diet high in saturated fat has been linked to high levels of cholesterol in the blood.If there is too much cholesterol in the blood it can start to build up in the coronary arteries. This causes pla...
Answered by • Biology tutor
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Describe the differences and similarities between osmosis and diffusion (4 marks)

Similarities:neither require energyboth move particles from a high concentration to a low concentration area differences:Osmosis requires a partially permeable memberonly water moves by osmosis but liquids a...
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Answered by Brian W. • Biology tutor
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How does the structure of the grana optimise its function?

The grana is made up of stacked thylakoid membranes which give a larger surface area upon which the photosystems and chlorophyll can trap light energy. The space within the membrane stack allows proton movem...
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Answered by Sophie M. • Biology tutor
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Name two advantages and disadvantages of hormonal contraception?

One advantages of hormonal contraception are that, when used properly i.e. taken on time and regularly, they are more effective than physical barrier contraceptives such as condoms or diaphragms. However the...
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Answered by Sophie M. • Biology tutor
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Outline the process of protein synthesis (8 marks).

Firstly, we need to understand what the question title is asking... ' Outline ' means to roughly describe and give a summary of the key points of a ' process ' which is a series of chronological stages. Prot...
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Answered by Natalie H. • Biology tutor
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