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.
If you want to ripen your mangoes quickly, then do the following: Once ripe, mangoes should be put in the refrigerator to slow down the ripening process. Whole, ripe mangoes may be stored for up to 4-5 days in the refrigerator. 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.