Gene Regulation and Expression Quiz

What role does allolactose play in the lac operon system?

• It acts as a repressor.

• It acts as an inducer.

• It acts as a promoter.

• It acts as an enhancer.

Which of the following processes is involved in chromatin remodeling?

• DNA replication

• Histone acetylation

• RNA splicing

• Protein synthesis

What happens to the lac operon when lactose is present in the environment?

• The repressor binds to the operator.

• The repressor is deactivated.

• The operon is repressed.

• The operon is permanently turned off.

What is the function of proto-oncogenes in cellular processes?

• They suppress tumor formation.

• They promote cell division and growth.

• They repair damaged DNA.

• They induce apoptosis.

Although the lac operon widely exhibits negative control, how does the lac operon demonstrate positive control?

• By using a repressor to block transcription.

• By using an activator to enhance transcription.

• the CAP protein helps RNA polymerase bind

• when allolactose helps the repressor unbind

describe the promoter proximal region:

• These sequences vary between genes, allowing for cell-type-specific expression

• It acts as a binding site for proteins that regulate gene expression.

• The promoter proximal region is upstream of the gene

• It silences gene expression.

What is the significance of the term "upstream" in genetics?

• It refers to the region after the gene.

• It refers to the region before the gene.

• It refers to the region within the gene.

• It refers to the region at the end of the gene.

What is the primary function of enhancers in gene regulation?

• They initiate transcription.

• They increase the rate of transcription.

• They terminate transcription.

• They inhibit transcription.

How does blocking RNA polymerase affect gene expression?

• It enhances transcription.

• It prevents transcription.

• It initiates translation.

• It terminates translation.

Which of the following is a characteristic of a promoter region?

• It is located downstream of the gene.

• It is located upstream of the gene.

• It is located within the gene.

• It is located at the end of the gene.