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.
Mangoes that are not ripe taste like cardboard â they are tough and lacking in flavor. In order to enjoy a mango, you have to make sure the mango is ripe before eating it. So how do you tell when a mango is ripe? To tell if a mango is ripe, give it a gentle squeeze on the sides. If itâs ripe, it should give a little bit under your fingers. Checking if the mango is ripe works the same when as telling if an avocado is ripe. If the mango feels rock-hard under your fingers, it is not ripe!