Enzymes that are produced by microbes only when their substrates are present. When not needed,they are not produced. This is in contrast to constitutive enzymes,which are always produced.僅在底物存在時(shí)才能由微生物產(chǎn)生的酶。如不需要,可不合成。這與組成酶相反,后者在細(xì)......（本文共 207 字）     [閱讀本文] >>