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.
The entire fruit is edible, including the slightly waxy skin, unlike other tropical fruits. The flesh is crunchy, firm, and extremely juicy, having a texture similar in consistency to that of grapes. Carambolas are best consumed when ripe, when they are yellow with a light shade of green.