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.
Basic structure of DNA showing spiral backbone and different nucleotides (Forluvoft via Wikimedia Commons). DNA itself is made up of smaller molecules called nucleotides that link up together to form two chains that are twisted together, a bit like the separate strands of a rope.But this twisted chain is not physically used to make, or build anything else other than more molecules of DNA. flat layer of cells forms human skin and a layer of cells folded to form a tube is how things like intestines or windpipes are formed. Cells, not DNA, are what act as building blocks. So, starting with DNA and finishing with a human: Genes are made of DNA.