There are various permanent hair straightening systems out there, but they generally use the same chemical process to alter the hairâs structure. An alkaline chemical solution is first applied to the hair, and this breaks down the many disulfide bonds within the hair that cause it to kink and curl.ons. 1  As the name suggests, this technique relaxes hair rather then leaving it poker straight, so if you want absolute stick straight and frizz-free hair, this method may not be for you. 2  As with every chemical process, the ever present risk of damage is there.
But they all consist of 4 nucleotides 2 made of purine bases which are adenine and guanine and 2 pyrimidine bases which are thymine and cytosine. The purine based nucleotides always pair with their base pair pyrimidine based nucleotide.In DNA Adenine is paired with thymine and guanine pairs with cytosine.But if it's RNA there is a special exception which replaces thymine with Uracil pairing with adenine.he purine based nucleotides always pair with their base pair pyrimidine based nucleotide. In DNA Adenine is paired with thymine and guanine pairs with cytosine.
The monomers of DNA are called nucleotides, and the polymer is a polynucleotide. There are four different nucleotides in DNA called A, T, G, and C for the nitrogenous base sidegroup (adenine, thymine, guanine, and cytosine respectively) attached to the sugar-phosphate backbone (deoxyribose-phosphate) of a nucleotide.