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Explain how atherosclerosis can lead to damage of heart muscle.

Atherosclerosis is the build up of fatty deposits within the arteries. This leads to a blockage of the artery, narrowing the lumen. If this happens to a coronary artery (one supplying the heart with blood) t...
OH
Answered by Oona H. • Biology tutor
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What is phototropism?

Phototropism is the directional growth of a plant in response to a light stimulus.If it grows towards the light then it is positive (the most common type of phototropism) and if it grows away from the stimul...
SJ
Answered by Sacha J. • Biology tutor
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Explain how a resting potential is maintained in a neurone (4 marks)

Membrane less permeable to sodium ions Sodium ions actively transported out... ...(by) sodium ion carriers inside of the membrane is negative compared to the outside / 3Na+ out and 2K+ in Must talk about Sod...
ML
Answered by Maya L. • Biology tutor
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Briefly describe the process of mitosis.

Prophase: The chromosomes condense and the nuclear envelope breaks down. Centrioles move to opposites ends of the cell, forming the mitotic spindle. Metaphase: Chromosomes line up at the equator of the cell ...
SP
Answered by Sasha P. • Biology tutor
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Describe the role of a ribosome in the production of a polypeptide.

The ribosome binds to the mRNA and reads the codon codeThe ribosome brings the correct tRNA molecules to each mRNA codon, using complementary base pairing between the mRNA codons and the tRNA anticodonsEach ...
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Answered by Elizabeth H. • Biology tutor
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