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DNA (Deoxyribonucleic acid) (Introduction (DNA is a nucleic acid, that'…
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A and G are purines (a type of organic compound), while C and T are pyrimidines. 
Two purines are too large to fit in the space between the strands, while the pyrimidines are too small, therefore the purines will bond with the pyrimidines.
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DNA is known as an acid because the acidic part is on the outside, making it more reactive than the basic part, which is on the inside.
The more G-C bonds a helix has, the stronger it is, since they have 3 bonds, rather than the 2 of the A-T bonds.
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One of the strands is going upwards, while the other is going downwards.
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Most of the DNA is the noncoding DNA, which doesn't encode protein sequences. It can, however, influence in the activation of genes, such as Cancer.