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What is a stem cell?

A stem cell is an unspecialised cell that can undergo differentiation to form a specialised cell. Differentiation describes changes that happen to a cell that result in it transforming into a different cell ...
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Answered by Catriona C. • Biology tutor
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A curve has equation y = (x-1)e^(-3x). The curve has a stationary point M. Show that the x-coordinate of M is 4/3.

(In the following answer, y' denotes dy/dx , i.e. the derivative of y with respect to x , where y is a function of x ) y = (x-1)e -3x = uv , where u = x-1 and v = e -3x . We have that u' = 1 and using the Ch...
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"The Forms teach us nothing about the physical world" How would you introduce this essay?

The 2 main things which are NEEDED for a A/A* introduction in a Religious Education essay are the following - Give contextual information:Imperfection to Plato was that everything in our world changes. There...
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How do I find the reultant force acting on an object sitting on a slope?

Firstly, you should consider what forces are acting on the object and in what direction. It helps to draw a large diagram to label. In most questions, the forces should be told to you. It helps to keep in mi...
Answered by • Maths tutor
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How do I know when to use the past preterite or the past imperfect?

This is something that as you use them more, they will come more naturally, but there are a few ways to remember them. In general, the preterite is use for a past action that has been completed and is finish...
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Answered by Ami S. • Spanish tutor
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