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What are the causes of genetic mutations ?

Muataions within genes can be caused by several ways. Sometimes they can be spontaneous or other times they can be induced by environmental factors. These factors can include chemicals such as chemicals foun...
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Answered by Amy M. • Biology tutor
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Describe the process of translation

Translation takes place on ribsomes, which can be found on the rough endoplasmic reticulum (ER) or within the cytoplasm. Once the mRNA has been exported from the nucleus it binds to a ribsome. The ribosome s...
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Answered by Amy M. • Biology tutor
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If f(x)=7-4x, given that f(c)=9, find c

f(c) means let x=c. Remember that c is just an unknown number. The expression f(c)=9 means that when we put c through the function f(x)=7-4x, it gives the answer 9. Therefore we know 7-4c=9 is true. Now we h...
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Answered by Emma F. • Maths tutor
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Find the tangent of the following curve, y=xe^x, at x=1 expressing it in the form y=mx+c?

Firstly, we calculate the y-value when x=1, namely y=e. Then we need to find the gradient of this curve at x=1, which can be determined by taking the derivative of y and then valuate it at x=1. So dy/dx=xe^x...
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Answered by Bruno S. • Maths tutor
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The government has introduced an ad valorem tax on petrol. The likely effect is: A) Increase in sales of petrol B) Increase in carbon emissions from electric cars C) Increase in demand for bus travel D) Decrease in sale of electric cars

Four mark questions are a great way to pick up marks. There is a simple strategy to remember when answering these. Firstly, always write down your definition of the key word(s). Even if you do not know the c...
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Answered by Binal P. • Economics tutor
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