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.
Cooler temperatures delay the ripening of the fruit. Check the mangoes for ripeness every one to two days during the ripening process. Press the mango gently with your thumb. If the fruit remains firm but indents slightly under pressure, it is ripe. Mangoes typically take between three and eight days to ripen.ooler temperatures delay the ripening of the fruit. Check the mangoes for ripeness every one to two days during the ripening process. Press the mango gently with your thumb. If the fruit remains firm but indents slightly under pressure, it is ripe. Mangoes typically take between three and eight days to ripen.