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As you go across a period, the next atom will have 1 more proton in its nucleus than the one before. Therefore, the nucleus of each atom will have an increasingly positive charge, meaning a stronger nucle...

DNA helicase unzips and unwinds the DNA double helix by breaking hydrogen bonds between complementary base pairs. This exposes the bases on two strands creating template strands. Free floating nucleotides...

Have you seen anything like this before? 

What do you understand by this equation? 

How do you expand brackets? Grid/smiles and eyebrows 

How confident are you with factors and times ...

(x+2)^2=4=>x+2=2+>x=0 or x+2=-2=>x=-4

Unlike if we had just x in the numerature, here the chain rule will do us no good.  Integration by parts in this case also is little help - we end up with expressions at least as difficult as we started w...