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How big is ?

is 5 nanometers
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Alpha Helix
The alpha helix is one of the secondary structures of proteins. Many proteins have alpha helixes within them. Hemoglobin and myglobin are proteins that are made of about 70% alpha helixes!
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DNA
A single human cell contains 3 meters of deoxyribonucleic acid. That DNA, while being only a few nanometers across, holds around 25,000 genes in around 3 billion base pairs. That is a lot!
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