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.
Ripeness Characteristics. When you harvest mangoes will depend on how the fruit appears and feels. Ripening mangoes progress in color from green to yellow with a reddish blush, but the exterior color is not the best way to tell if the mango is ripe. The interior flesh color is a better indicator.