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How do white blood cells respond to infections?

The white blood cells detect the foreign antigens on the cells surface. They then rapidly produce antibodies which match the antigens and attach onto them. This allows other white blood cells to engulf the p...
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Answered by Olivia D. • Biology tutor
4200 Views

Explain why, in the long run, a firm will always make normal profits.

The condition for this scenario is that perfect competition must hold, whereby there is free entry to and exit from the market, and perfect information is available to all firms.In the short run, if firms su...
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Answered by Joe R. • Economics tutor
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‘The downfall of Tsar Nicholas II in February/March 1917 was due to popular discontent with the tsarist regime.’

'Let those in power make no mistake about the mood of the people… never were the Russian people… so profoundly revolutionised by the actions of the government, for day by day, faith in the government is stea...
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Answered by Ann-Marie D. • History tutor
7322 Views

Find out the stationary points of the function f(x)=x^2*e^(-2x)

Using the product rule (u'v+v'u, where u and v are the chosen substitutes) to find the first derivative will be dy/dx=x'=2x e^(-2x)+x^(2)e^(-2x) (-2)=2x e^(-2x) (x-x^2). This will give the details about the ...
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Answered by Bilkan I. • Maths tutor
3745 Views

What enzymes are used in the process of DNA replication and what are they used for?

The two enzymes used in DNA replication are DNA helicase and DNA polymerase.The DNA helicase is used to break the hydrogen bonds between the two DNA strands so that the strands can unzip. After free nucleoti...
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Answered by Seraphima G. • Biology tutor
3749 Views