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In what way is a diseased coronary heart artery differ from a healthy one, and what are two ways to treat it?

A diseased coronary heart artery has fatty diposits (atheroma) that narrow the lumen, and block bloodflow. As the coronary arteries primarily serve to nourish the heart, this can weaken it and if it remains ...
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Answered by Christine M. • Biology tutor
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Describe the process of transcription

Transcription is the process where a segment of DNA is copied into a segment of mRNA. This takes place in the nucleus. First the segment of DNA needs to be unzipped, so an enzyme breaks the hydrogen bonds be...
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Answered by Calum L. • Biology tutor
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What is the difference between a bacteria and a virus?

Both are considered microorganisms but viruses are arguably not living organisms as they cannot reproduce without living hosts . Apart from this, viruses are much smaller than bacteria and differ in terms of...
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Answered by Akriti G. • Biology tutor
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Describe how a sperm cell is adapted to its role (4 marks)

The role of a sperm cell is to fertilise an egg. The head contains the nucleus, which holds the male genetic material. It has a tail for swimming to the egg. It is packed with mitochondria to supply the ener...
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Answered by Aamna W. • Biology tutor
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What is the difference between meiosis and mitosis?

Meiosis consists of 2 separate divisions and produces 4 genetically different daughter cells, whereas in mitosis there is only one division and it produces 2 genetically identical daughter cells. Meiosis hap...
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Answered by Emily H. • Biology tutor
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