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Explain what is meant by epigenetics and how it can inhibit transcription.

Epigenetics is the process by which heritable changes in gene function are caused by environmental factors. These changes are not within the base sequence of our DNA but are in fact due to the chemical tags ...
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Answered by Emily T. • Biology tutor
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Why are metals good conductors of electricity?

Metals form metallic bonds, where unlike in covalent or ionic bonding, electrons are delocalised. This means the electrons can move freely throughout the metallic structure. Electricity is the flow of electr...
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Answered by Olivia K. • Chemistry tutor
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The equation of line A is y = 6x -4. The equation of line B is 2y - 12x + 14 = 0. Are these two lines parallel?

Line A has a gradient of 6, because it is in the form y = mx + c, where m=6. Line B can be rearranged to y= 6x - 7, so the gradient is also 6. The gradient of both lines is the same, so they are parallel.
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Answered by Matthew L. • Maths tutor
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Discuss the varying patterns of migration into the UK since the end of the second world war.

There are different components to this question: Migration into the UK continues to change on a consistent basis. In the past, following the end of the war this saw an influx of families on a large scale fro...
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Answered by Akul P. • Geography tutor
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During take-off from earth, an astronaut of mass 76kg has an area of contact with his seat of 0.095m^2. Calculate the average pressure on the seat when the upward acceleration of the rocket is 47ms^-2

There are two parts to this question that we should consider seperately: Firstly, we need to work out the total thrust force that is being applied through the seat onto the astronaut. Critically, this is the...
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Answered by Oliver N. • Physics tutor
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