Molecular Biology Help Negative occurs because the gene pro

Molecular Biology Help!

Negative _____________ occurs because the gene product regulates its own synthesis.

Catabolite-sensitive operons cannot be induced if _________ is present.

LacI codes for the lac ______________.

A carrier molecule, lactose ___________ is required for entry of lactose and other galactosides into the E. coli bacterium.

Solution

Genes which are regulated by its own product are called as autoregulation. It can be positive or negative.
So answer is autoregulation.

Catabolite sensitive operons cannot be induced if glucose is present.If both lactose and glucose are present, synthesis of -galactosidase is not induced until all the glucose has been utilized.
So answer is glucose.


Lactose transport into cell is mediated by an integrated carrier protein known as permease. It acts as symporter which uses the proton gradient towards the cell to transport -galactosidase such as lactose in the same direction into the cell.
So answer is permease.

The LacI gene codes for the repressor of the lac operon.
So answer is repressor.