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.
Mango Ripening Guide: Tips to help you spot a ripe mango. Itâs easy to know when your ChampagneÂ® mango is ripe â just look at the color! As the fruit matures, it turns from green to a deep, golden yellow (refer to the ripening guide above). The mango will also get progressively softer as it ripens, which brings us to our next bit of advice: Not all mangos change color as they ripen, so the best way to tell if mangos are ripe is to squeeze them gently.