Science
What is Chirality?
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.
See it, don’t just read it.
Watch a 2-minute lesson with voice + animation that explains chirality.
Key things to understand
- 1A chiral molecule and its mirror image are not identical, like left and right hands.
- 2The two forms are called enantiomers.
- 3Living systems often use only one 'handedness' — for example, life's amino acids.
- 4One form of a drug can heal while its mirror image is useless or harmful.
- 5It's a key reason drug makers must control molecular shape precisely.
Frequently asked questions
- 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.