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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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For a named country which you have studied, describe the problems caused by an ageing population.

Name of country: Japan Japan has a population of 127 million and roughly 23% are over the age of 65 and this huge proportion can prove to be problematic. In general, the elderly require more expensive health...
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Answered by Natasha C. • Geography 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
3341 Views

Find the indefinite integral of ( 32/(x^3) + bx) over x for some constant b.

To integrate (32/ x 3 + bx) over x we can integrate each part separately. This is because addition of two integrals is the same as integrating the total of the elements. So we integrate 32/x 3 first, see tha...
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Answered by Becky O. • Maths tutor
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