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.
Mangoes are tropical fruits and sweet in taste. They are best served freshly cut in fruit salads, smoothies, or as a frozen snack. Like papayas, mangoes are also commonly found as a breakfast side dish. Freezing mangoes are the best method to prepare a large quantity to store.