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What is a stem cell?

A stem cell is an undifferentiated cell that can differentiate into specialised types of cells such as muscle cells or skin cells. A stem cell can give rise to many cells of the same or different types of ce...
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Answered by Emily G. • Biology tutor
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Work out 1 1/5 ÷ 3/4. Give your answer as a mixed number in it's simplest form

First we get rid of the first mixed fraction by making it top heavy:1=5/5, therefore 1 1/5= 6/5Then we flip the second fraction to get its reciprocal: 4/3 Now we change the sign to multiply rather than divid...
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Answered by Michael C. • Maths tutor
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A reaction can take place between an acid and an alkali: a) Name this type of reaction. (1 mark) b) Write a word equation that shows the reaction between nitric acid and potassium hydroxide. (1 mark) c) Write the symbolic equation (1 mark)

Answer Answer outline and marking scheme for question: 2 a) Neutralisation. (1 mark) b) nitric acid + potassium hydroxide → potassium nitrate + water(Mark is gained for writing potassium nitrate as the salt)...
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Answered by satvir c. • Chemistry tutor
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Describe the multi-store model of memory

The multi-store model of memory (Atkinson and Shiffrin, 1968) suggests that information from the environment initially enters sensory memory, which includes senses such as vision and hearing. If this informa...
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Solve 5 < x² + 1 < 10

We can take 1 away from all elements to obtain 4 &lt; x² &lt; 9. Now, it's important to notice that when we square a negative, it gives us a positive, so when we take a square root to get 2 &lt; x &lt; 3 we ...
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Answered by Mateusz O. • Maths tutor
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