AP BIOLOGY Chapter 18

Which of the following statements best defines the term operon?

What molecule binds to promoters in bacteria and transcribes the coding regions of the genes?

What is allosteric regulation?

Under which conditions are the lac structural genes expressed most efficiently?

What happens to the expression of the lacI gene if lactose is not available in the cell?

What is the function of the lacZ gene?

Which of the following enzymes converts ATP to cAMP?

True or false? The mechanism by which glucose inhibits expression of the lac structural genes is known as catabolite stimulation, whereas the mechanism by which lactose stimulates expression of the lac structural genes is known as allosteric regulation.

The operon model of the regulation of gene expression in bacteria was proposed by _____.

Which of these is NOT a component of the lac operon?

Regulatory proteins bind to _____.

In the presence of a regulatory protein the lac operon is _____.

Which of these is a regulatory gene?

What does the operon model attempt to explain?

The tryptophan operon is a repressible operon that is

This protein is produced by a regulatory gene

When this is taken up by the cell, it binds to the repressor so that the repressor no longer binds to the operator

For a repressible operon to be transcribed, which of the following must occur?

How does active CAP induce expression of the genes of the lactose operon?

Transcription of the structural genes in an inducible operon

The lactose operon is likely to be transcribed when

Which of the following terms describes the DNA-protein complexes that look like beads on a string?

Which of the following regulatory elements is not composed of DNA sequences?

True or false? Regulatory and basal transcription factors regulate transcription by binding to the promoter.

Which of the following regulatory DNA sequences might be located thousands of nucleotides away from the transcription start site of a gene?

Which of the following events in transcription initiation likely occurs last?

True or false? One possible way to alter chromatin structure such that genes could be transcribed would be to make histone proteins more positively charged.

Two potential devices that eukaryotic cells use to regulate transcription are

In both eukaryotes and prokaryotes, gene expression is primarily regulated at the level of

Eukaryotic cells can control gene expression by which of the following mechanisms?

This binds to a site in the DNA far from the promoter to stimulate transcription:

Gene expression might be altered at the level of post-transcriptional processing in eukaryotes rather than prokaryotes because of which of the following?

Which of the following is most likely to have a small protein called ubiquitin attached to it?

_____ bind(s) to DNA enhancer regions.

What is the event that IMMEDIATELY follows the last event of this animation?

Which of these indicates an enhancer region?

Which of these directly bind(s) to the promoter?

Enzyme complexes that break down protein are called _____.

The nuclear membrane's role in the regulation of gene expression involves _____.

What is the function of a spliceosome?

Protein-phosphorylating enzymes' role in the regulation of gene expression involves _____.

Which of the following describes the function of an enzyme known as Dicer?

The process of cellular differentiation is a direct result of

In most cases, differentiation is controlled at which level?

Use the accompanying diagram of the key developmental events in the life cycle of the fruit fly Drosophila to select the statement that best describes the timing and coordination of events necessary for normal fruit fly development.

A(n) _____ is a stretch of DNA consisting of an operator, a promoter, and genes for a related set of proteins, usually making up an entire metabolic pathway.

The _____ is/are arranged sequentially after the promoter.

A(n) _____ is a specific nucleotide sequence in DNA that binds RNA polymerase, positioning it to start transcribing RNA at the appropriate place.

A(n) _____ codes for a protein, such as a repressor, that controls the transcription of another gene or group of genes.

Regulatory proteins bind to the ____ to control expression of the operon.

A(n) ____ is a protein that inhibits gene transcription. In prokaryotes, this protein binds to the DNA in or near the promoter.

A(n) _____ is a specific small molecule that binds to a bacterial regulatory protein and changes its shape so that it cannot bind to an operator, thus switching an operon on.