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The easiest way to visualise this is to imagine a line of four dinner ladies serving you different parts of a school meal e.g. the first peas, the second mash potatoes, the third chicken and the fourth gr...

Firstly, there are chemical differences between the two nucleic acids. DNA has the following structural properties:-double stranded and anti-parallel polymer held together by (relatively) weak hydrogen bo...

Both antigenic shift and drift are used by viruses to adapt to selection pressures and avoid host immune systems. 

Antigenic shift is a slow change in the viral genes ove...

By recalling that e^ln(a) = a, you can rewrite 3^2x as e^2xln(3).

Then, you can differentiate this like any other e function, by using the product rule.

To form a conditional clause you need to start with the word 'si' - if, then make sure that you are using the right tenses for the rest of the sentence!

1. Si + present + future (e.g. si ...