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What is chirality?

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Quick answer

Chirality means a molecule comes in two mirror-image forms that can't be perfectly overlaid, like your left and right hands. The two versions can behave very differently in living things — which is hugely important in biology and medicine. A chiral molecule and its mirror image are not identical, like left and right hands.

Key things to understand

  1. A chiral molecule and its mirror image are not identical, like left and right hands.
  2. The two forms are called enantiomers.
  3. Living systems often use only one 'handedness' — for example, life's amino acids.
  4. One form of a drug can heal while its mirror image is useless or harmful.
  5. It's a key reason drug makers must control molecular shape precisely.

People also ask

Why is chirality important in medicine?
The body reacts to a molecule's shape, so one mirror-image form of a drug may work while the other does nothing or causes harm.
What are enantiomers?
The two non-identical mirror-image versions of a chiral molecule, like a left-handed and a right-handed glove.
Why does life prefer one handedness?
Biological molecules like enzymes are themselves chiral, so they fit only the matching handed version — life standardized on one early on.