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.
Shares & Saves. Save. Mangoes taste best ripe -- and they develop quickly. You can tell a mango is ripe when the fruitâs flesh is soft like a ripe peach. Coloring is not a certain indicator of ripeness, however, according to the Cookthink website, most varieties turn a yellow shade when ripe.A mango develops a strong, fruity smell when it is ready to be eaten. (Michele D. Lee/Demand Media).ou can tell a mango is ripe when the fruitâs flesh is soft like a ripe peach. Coloring is not a certain indicator of ripeness, however, according to the Cookthink website, most varieties turn a yellow shade when ripe. A mango develops a strong, fruity smell when it is ready to be eaten. (Michele D. Lee/Demand Media).