Why do we need DNA ?

Why do we need DNA ?

We need DNA (Deoxyribonucleic acid) as we exist because of DNA.
DNA is important for all living organisms as it plays important role in inheritance, code proteins and most important is that it guide the genetic instruction for survival of life.
As we know, cells are the basic structural and functional unit of life and DNA code the instructions for cell development, reproduction or death.
The DNA code contains instructions that are required to make the proteins. Proteins are essential for growth and development of body. Proteins function as enzymes, catalyzing chemical reactions, protect and maintain the cell structure, act as signal molecule so that cells to communicate with other cells.
DNA determine the traits of an organism. The order of the nitrogen bases which are adenine, guanine, cytosine and thymine in a DNA molecule will make the chemical code and this code contains the instructions to make proteins. This is how instructions carried by DNA flows into proteins: DNA → RNA → protein
The cell reads the DNA code in groups of three bases called as codon, that specifies that which amino acid will be added next during protein synthesis.
DNA plays important role in gene expression. Genes are transcribed and then translated to form proteins. When cell needs a particular protein, gene is switched on which means gene is expressed, where specific region of DNA is copied into a transcript called as messenger RNA (mRNA). Now mRNA contains the code for the protein, then a process called as translation occurs.

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