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 nectarines have the skin of the nectarine, and the flesh is more like the mango. So, the fruit should be fairly firm, but give a little when squeezed, when ripe. Just liâ¦ke the nectarine and the mango.