Top answers


How can you stop a cell culture from becoming contaminated?

Sterilising petri dishes and agar before use. Taping lid of petri dish whilst microbes are glowing. Sterilising innoculating loops before use.Carry out experiment near bunsen burner for updraft.
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Answered by Iona H. Biology tutor
4095 Views

How do I select and memorise my quotes for the exam?

It can truly add pressure to a student when they have to remember quotes for their exam. How to go about selecting and revising them is also a struggle, however here are some step by step tips on how to do e...
TG
14788 Views

What are the benefits of innovation within a business?

Definition Innovation is the successful exploitation of new ideas. This is predominantly achieved through research and development (R&D). R&D is the necessary investigations in order to discover new ...
JH
43783 Views

How do I solve the quadratic equation x^2+4x+3=0

When solving a quadratic equation like this it is useful to write it in the form (x+a)(x+b)=0, as this is simply saying 'two numbers multiplied together equal zero'. A general rule in maths is that whenever ...
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Answered by Edward R. Maths tutor
6926 Views

How do you integrate the function cos^2(x)

At first, you might think that it is possible to perform this integral simply by inspection, using the 'backwards chain rule'. This method would consist of adding one to the power, to get cos 3 (x), then div...
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Answered by Edward R. Maths tutor
8620 Views