In the absence of lactose, the repressor protein encoded by the I gene binds to the lac operator and prevents transcription. Binding of allolactose to the repressor causes it to leave the operator. This enables RNA polymerase to transcribe the three genes of the operon.
A tough-skinned tropical fruit, the mango features a sweet, orange- to red-color flesh inside when ripe. Kensington pride, Kent, Palmer and sensation are only a few of the many varieties of mango available through groceries and markets.
In the winter when you open a jar, the mangoes will taste MUCH better than anything you've ever had from a store, and by selecting the right fruit, it will use less sugar than store-bought canned mangoes. Mangoes, like many sweet stone or pitted fruit, can be packed in very light, light or medium sugar syrup.