Question

Give one role of lac permease in the lac operon.

Answer 1

Lac Permease:

1. The lac permease can be defined as the membrane protein that belongs to the superfamily of major facilitators.
2. The galactosides such as lactose are transported by the lac permease into the cell.
3. This transportation is performed using the proton gradient and its direction similar to the direction of the proton gradient.

Role Of Lac Permease In Lac Operon:

1. The lacY gene is used to code the lac permease in the lac operon.
2. Its principal function in the lac operon is to transport lactose into the cells via the proton gradient.
3. The transport mechanism used is active co-transport, which is pushed by an electrochemical gradient of ${\mathrm{H}}^{+}$ that is directed internally.