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Your DNA (Deoxyribo Nucleic Acid) is a long string of sugar and phosphate molecules contained within your genes, which encode for proteins, which enable you to carry out all the biological functions you need to live. The sugar and phosphate molecules act as a "backbone" to hold in place 4 special molecules called "bases" which can repeat at length in any order. Other molecules "read" these bases, and create a protein molecule from that reading.
As an analogy, a computer contains a piece of hardware in its memory called a register (DNA) which contains a series of zeros and ones (bases) which are read and translated into alphabetic and numeric characters (proteins.)
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