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.
Ripen Mangoes in Microwave. 1  Using a knife, poke the mango in 4-5 places to help escape the steam. 2  Wrap the mango in a kitchen towel and place it in the microwave for 10 seconds. 3  Take out and press it with fingers to check its ripeness.4  If the mango has become soft, then it is 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.