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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...
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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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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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Describe the synthesis of glomerular filtrate from the blood

Ultrafiltration in the glomerulus caused by high hydrostatic pressure due to the diameter of the afferent tubule being larger than that of the efferent tubule forcing smaller blood plasma, ions and other bio...
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Answered by Ram N. • Biology tutor
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Describe the structure of starch

Starch is a polysaccharide of alpha glucose. It is made up of amylose and amylopectin. It forms a branched structure to allow it to be compact, this is due to the fact it contains 1-4 and 1-6 glycosidic bonds.
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Answered by Ediz C. • Biology tutor
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