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Do you have any advice regarding nervousness during an exam?

Nervousness during exams is a problem for many students, especially when faced with the task of writing multiple full length essays under a time limit. However, it is definitely possible to evade those pesky...
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How does gel electrophoresis seperate DNA?

The DNA from PCR is placed into wells of agarose gel and a buffer solution is poured over it. An electrical current is passed through the gel due to the conduction of the buffer solution. The DNA fragments m...
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Answered by Holly D. • Biology tutor
6410 Views

What happens when some alkali is added to a buffer solution?

The dissociation of the weak acid ‘HA’ would be shown as:HA (aq) ⇌ H + (aq) + A – (aq)Adding alkali will add OH - ions to the solution. These will react with the H + ions present in the solution, producing w...
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Answered by Holly D. • Chemistry tutor
15579 Views

When do I use the subjunctive?

1- What is the subjunctive? It is a mood (not a tense!) which expresses uncertain ideas. 2- So when do I use it? Set phrases with 'que' Negative phrases with 'que' which express emotion or doubt or other unc...
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Answered by Hannah P. • French tutor
2079 Views

Find the exact value of the gradient of the curve y=e^(2-x)ln(3x-2) at the point on the curve where x=2.

This is a typical gradient question for A2 papers, as it requires use of the Product Rule and Chain Rule, as well as knowledge of e^x. Firstly, we can see that we will need to use the Product Rule as e^2-x a...
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Answered by Sophie K. • Maths tutor
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