Enzymes, which are chiral, usually only work with one enantiomer of a chiral substrate. Imagine an enzyme as having a glove-like cavity that binds a substrate. If this glove is right-handed, then one enantiomer will fit inside and be bound, whereas the other enantiomer will have a poor fit and is unlikely to bind.
ɛ n z aɪ m z WORD_BOUNDARY w ɪ t̠ʃ WORD_BOUNDARY ɑ ɹ WORD_BOUNDARY k aɪ ɹ ə l WORD_BOUNDARY j uː ʒ uː ə l i WORD_BOUNDARY oʊ n l i WORD_BOUNDARY w ɜː k WORD_BOUNDARY w ɪ ð WORD_BOUNDARY w ʌ n WORD_BOUNDARY ɛ n æ n t ɪ ə m ə ɹ ɹ WORD_BOUNDARY ə v ə WORD_BOUNDARY k aɪ ɹ ə l WORD_BOUNDARY s ʌ b s t ɹ eɪ t WORD_BOUNDARY ɪ m æ d̠ʒ ɪ n WORD_BOUNDARY ʌ n WORD_BOUNDARY ɛ n z aɪ m WORD_BOUNDARY æ z WORD_BOUNDARY h æ v ɪ ŋ WORD_BOUNDARY ʌ WORD_BOUNDARY ɡ l ʌ v l aɪ k WORD_BOUNDARY k æ v ɪ t i WORD_BOUNDARY ð æ t WORD_BOUNDARY b aɪ n d z WORD_BOUNDARY ʌ WORD_BOUNDARY s ʌ b s t ɹ eɪ t WORD_BOUNDARY ɪ f WORD_BOUNDARY ð ɪ s WORD_BOUNDARY ɡ l ʌ v WORD_BOUNDARY ɪ z WORD_BOUNDARY ɹ aɪ t h æ n d ɪ d WORD_BOUNDARY ð ɛ n WORD_BOUNDARY w ʌ n WORD_BOUNDARY ɛ n æ n t ɪ ə m ə ɹ WORD_BOUNDARY w ɪ l WORD_BOUNDARY f ɪ t WORD_BOUNDARY ɪ n s aɪ d WORD_BOUNDARY æ n d WORD_BOUNDARY b iː WORD_BOUNDARY b aʊ n d WORD_BOUNDARY w ɛ ɹ æ z WORD_BOUNDARY ð ɪ WORD_BOUNDARY ʌ ð ə ɹ ɹ WORD_BOUNDARY ɛ n æ n t ɪ ə m ə ɹ WORD_BOUNDARY w ɪ l WORD_BOUNDARY h æ v WORD_BOUNDARY ʌ WORD_BOUNDARY p ʊ ɹ WORD_BOUNDARY f ɪ t WORD_BOUNDARY æ n d WORD_BOUNDARY ɪ z WORD_BOUNDARY ʌ n l aɪ k l i WORD_BOUNDARY t ə WORD_BOUNDARY b aɪ n d WORD_BOUNDARY