DNA — The Instruction Book of Life
We learnt about DNA in school as a long, complicated name: deoxyribonucleic acid. We remembered the double-helix diagram, but perhaps not the wonder behind it.
DNA is like an instruction book inside our cells. It contains the information needed to build and maintain a living organism.
The instructions are written using just four chemical bases:
A — Adenine
T — Thymine
G — Guanine
C — Cytosine
Their arrangement creates an enormous amount of biological information.
A section of DNA that carries instructions for a particular functional product is called a gene. Thousands of genes together form part of the enormous instruction set that helps our cells know what to make and how to function.
And the book is not kept in just one place. DNA is packaged into chromosomes, which are found in the nucleus of most human cells.
Perhaps the most astonishing part is how tiny it is.
The DNA in a single human cell, if stretched out, would be roughly two metres long—yet it is packed into a microscopic nucleus.
When cells divide, this information must be copied with remarkable accuracy so that the new cells receive the necessary instructions.
So when we look at ourselves—our features, our growth, our countless biological processes—we are looking at the result of an extraordinarily complex system of information.
We learnt DNA = genetic material.
But the deeper lesson is much more beautiful:
Inside almost every cell in our body is a microscopic instruction book, written in a four-letter chemical language, that has been carrying life's information from one generation to the next.
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