etAP Gene Regulation 2.6.25

What is the function of a regulatory gene?

• It regulates the expression of another gene

• It is responsible for DNA replication

• It codes for a specific protein

• It is involved in protein synthesis

Where is a regulatory sequence usually found?

• Just below the gene

• In the middle of the gene

• Just above the gene

• At the end of the gene

What is the role of a regulatory protein in gene expression?

• It helps in DNA replication

• It is involved in mRNA translation

• It binds to the regulatory sequence to allow RNA polymerase to make the gene

• It activates the gene for protein synthesis

Which example represents positive control in gene regulation?

• The TATA box

• The TATA binding protein

• The trp operon

• The lac operon

What is the function of the operator in an operon?

• It codes for a specific protein

• It is a regulatory sequence

• It is involved in mRNA translation

• It acts as an on-off switch for gene expression

In the lac operon, what happens when lactose is present?

• The RNA polymerase is inhibited

• The repressor changes shape and no longer binds to the operator

• The genes are turned off

• The repressor binds to the operator

What is the function of tryptophan in the trp operon?

• It promotes gene expression

• It binds to the RNA polymerase

• It inhibits the repressor

• It activates the repressor

In eukaryotic gene regulation, what are transcription factors responsible for?

• Activating RNA polymerase

• Holding the DNA in place

• Inhibiting gene expression

• Allowing the attachment of RNA polymerase

What is the role of the TATA box in eukaryotic gene regulation?

• It is an operator

• It is a regulatory gene

• It is a regulatory sequence

• It is a regulatory protein

How does gene regulation in eukaryotes differ from bacteria?

• Eukaryotes have operons, while bacteria do not

• Eukaryotes have on-off switches, while bacteria have transcription factors

• Eukaryotes use transcription factors, while bacteria use repressors

• Eukaryotes have more complex control mechanisms involving transcription factors