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.
Methods To Ripen Mangoes. 1  Keep unripe mangoes at room temperature on your kitchen table, they will continue to ripen, becoming softer over several days. 2  Do not put unripe mangoes or any other fruits in a fridge as it will slow down the natural process of fruit ripening. Wrap the mango in a kitchen towel and place it in the microwave for 10 seconds. 2  Take out and press it with fingers to check its ripeness. 3  If the mango has become soft, then it is ripening. 4  Make a small cut and see if it is ripe enough.