Exam 18: Control of Gene Expression in Bacteria

Use this information to answer the question(s) below. -If she moves the operator to the far end of the operon, past the transacetylase (lacA) gene, which of the following would likely occur when the cell is exposed to lactose?

A compound known as X-gal is widely used in molecular genetic research. When wild-type (normal) E. coli is grown on medium containing X-gal, the bacterial colonies turn blue. In contrast, when lacZ mutants are grown on medium containing X-gal, the bacterial colonies remain their normal white color. X-gal is likely to be a compound ________.

Use this information to answer the question(s) below. -If she moves the repressor gene (lacI), along with its promoter, to a position at some several thousand base pairs away from its normal position, we would expect the ________.

Which of the following, when taken up by a cell, binds to a repressor so that the repressor no longer binds to the operator?

The product of the lacI gene is ________.

When many genes of an organism are globally regulated, those genes are considered as regulon genes. What is the common theme of such genetic regulation?

Allolactose, an isomer of lactose, is formed in small amounts from lactose. An E. coli cell is presented for the first time with the sugar lactose (containing allolactose) as a potential food source. Which of the following occurs when lactose enters the cell?

In what general way are regulons regulated?

In the first step of their experiments, Jacob and Monod treated E. coli cells with ultraviolet light or X-rays to ________.