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.
How To Pick A Mango Peak season for Ataulfo mangos is from March to June. When fully ripe, their skins turn from green to deep golden yellow and feel soft to the touch. (Tip: Pick up a case and get a discount. Once you taste one, buying a case seems like a very good idea!)