DNA

Function of DNA - Hereditary material used to pass genetic material from generation to generation, and cell to cell.

Three basic components:
Deoxyribose
Phosphate Group
Nitrogenous Base.

Bases: Cytosine always pairs with Guanine, Thymine always pairs with Adenine. Guanine and Adenine are longer molecules then Cytosine and Thymine. If they Guanine paired with adenine, the rung would be to long, and if Cytosine and Thymine paired, it'd be too short, as the distance between the two strands in a DNA molecule is constant, and thsi would not fit this pattern.

Triplet code: Three bases code for one amino acid, amino acids join together, and this forms a polypeptide chain. Polypeptides link together to form a protein. Therefore, the triplet code of animo acids are responsible for which proteins are syntheisised, since, a different combination of bases, makes a different amino acid.