ch 14

The intracellular concentration of the inducer blank remains high as long as lactose is available in the environment.

allolactose

When the lac repressor is bound to the operator, RNA polymerase ______ the lacZ, lacY, or lacA genes.

cannot transcribe

The somewhat imprecise term that describes how transcriptional regulation is influenced by glucose is

catabolite repression

The research of Monod and Jacob that led to the initial understanding of gene regulation stemmed from an interest in ______.

enzyme adaptation

True or false: The rate of transcription initiation rarely influences overall gene expression.

false

In catabolite repression, transcription is influenced by the presence of _____.

glucose

When lactose is depleted from the environment, the ______.

intracellular concentration of allolactose falls

A strain of bacteria containing F' factor genes is called a blank or a partial diploid

merozygote

What is the name for a strain of bacteria containing an F' factor?

merozygote

It has been shown that the lac operon has three blank sites to which the lac repressor can bind.

operator

When the lac repressor binds to the lac operatorBlank 1Blank 1 operator , Correct Unavailable site, RNA polymerase cannot transcribe the lacZ, lacY or lacA genes.

operator

A(n) blank is a group of two or more genes under the transcriptional control of a single promoter.

operon

An operon encodes a blank , Correct Unavailable mRNA, an RNA that contains the sequences of two or more genes.

polycistronic

In an operon, the ______ signals the beginning of transcription.

promoter

'' The operon is flanked by a blank that signals the beginning of transcription and a blank that signals the end of transcription.

promoter, terminator

Studies indicate that the lac operon has ______ operator site(s) for the lac repressor.

3

What happens when levels of allolactose rise inside an E. coli cell?

Allolactose binds to the lac repressor and prevents it from binding to the operator.

An operon is a group of two or more genes under the transcriptional control of ______.

a single promoter