grin from ear to ear. to give a very big smile He was grinning from ear to ear, as if he had just won the lottery.
DNA or deoxyribonucleic acid is a long molecule that contains our unique genetic code. Like a recipe book it holds the instructions for making all the proteins in our bodies. DNA replication is the process by which DNA makes a copy of itself during cell division.
A DNA strand is made up of hundreds of thousands of nucleotides put together. A nucleotide is a type of molecule (organic molecule, to be specific) that is made up of a phosphate, a sugar, and a nitrogen base. In all DNA nucleotides, there is always the same phosphate and sugar. But the nitrogen bases differ. There are four nitrogen bases in DNA--Adenine, Guanine, Cytosine, and Thymine.