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Are you right-handed or left handed?

29 Jun 2016, 21:21 UTC
Are you right-handed or left handed?
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Not such an important question. It turns out that sugars and proteins, essential to life, are either left-handed or right-handed, and researchers are now finding ‘handed’ or ‘chiral’ molecules out in space.
All of life’s chemistry seems to be based on chiral molecules of a certain handedness, a concept known as homochirality. All the amino acids that make up life’s proteins are left-handed, the sugars that form the helical backbone of DNA are all right-handed, and so on.

But why has life tied itself to right-handed sugars or left-handed proteins — why not the other way around? The answer, it turns out, might lie in the stars.
Image: National Radio Astronomy Observatory

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