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Describe the structure of a triacylglyceride

Triacylglycerides are a type of lipid composed of a glycerol head and three fatty acid tails. The fatty acid tails are long hydrocarbon chains which are non polar and so hydrophobic, and this is what causes ...
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Answered by Christian K. • Biology tutor
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How does myelination of neurones increase conduction velocity?

Myelination is the production of a myelin sheath - a fatty, electrically insulating layer formed by Schwann cells wrapping around the axons of neurons. This sheath is not continuous, there are gaps between S...
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Answered by Kavindi G. • Biology tutor
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Describe the process of semi-conservative replication

Process - key words from mark schemes are highlighted in bold 1. The enzyme DNA helicase breaks the hydrogen bonds linking base pairs of DNA. As a result, the double helix unwinds and into two separate stran...
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Answered by Tara C. • Biology tutor
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The development of palm oil plantations in Sumatra has removed areas of forest that provided the habitat for tigers. Explain why planting strips of trees to link the forests would have an effect on the frequency of genetic disorders in these tigers.

Areas of trees linking the remaining patches of forest will mean that the populations of tigers are no longer geogrpahically isolated. therefore they will be able to breed with a larger gene pool and the num...
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Answered by Ella S. • Biology tutor
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Explain how proteins can be used as a respiratory substrate.

When supplies of carbohydrate and lipid are inadequate, the body can use protein as a respiratory substrate- in times of prolonged starvation, tissue protein from muscles can even be broekn down for this pur...
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Answered by Lucy A. • Biology tutor
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