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Control of Gene Expression Learning Objectives

20 Questions

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Control of Gene Expression Learning Objectives

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Questions and Answers

Which process alters the sequence of mRNA?

Editing (correct)

Methylation

Acetylation

Translocation

What happens when a premature stop codon is produced in apo-B-48?

The protein becomes shorter (correct)

The mRNA becomes unstable

The mRNA is degraded

The protein becomes longer

Which molecules bind to specific RNA structures and affect mRNA stability and translation?

Iron-regulatory proteins (correct)

Transcription factors

miRNAs

Histones

What is the role of miRNAs in gene expression?

They prevent protein synthesis Signup and view all the answers

What effect does acetylation of histones have on gene expression?

It promotes gene expression Signup and view all the answers

What effect does methylation of DNA have on gene expression?

It represses gene expression Signup and view all the answers

Where do transcription factors act to regulate target genes?

Nucleus Signup and view all the answers

What is the role of mRNA stability in iron metabolism?

It regulates iron-related proteins Signup and view all the answers

Which process leads to mRNA degradation or translational inhibition?

miRNA binding Signup and view all the answers

What is changed by deamination to produce a premature stop codon in apo-B-48?

A single base Signup and view all the answers

Which condition activates the lac operon in lactose metabolism?

lac+ and glu- Signup and view all the answers

What role does the lac repressor play in the lac operon?

It represses transcription Signup and view all the answers

What happens to cAMP levels when glucose is scarce?

They rise Signup and view all the answers

What is the role of CAP in the lac operon regulation?

It enhances RNA polymerase binding Signup and view all the answers

What is the role of the stringent factor in the stringent response?

It conserves energy Signup and view all the answers

What happens to the trp operon in trp high conditions?

It is repressed Signup and view all the answers

What happens to the trp operon in trp low conditions?

It is activated Signup and view all the answers

What is the role of attenuation in trp operon regulation?

It prematurely terminates transcription Signup and view all the answers

Which structural motif is used by proteins to bind DNA?

All of the above Signup and view all the answers

What is the role of STF in the coordinate regulation of the galactose circuit in yeast?

It recruits chromatin remodeling complexes Signup and view all the answers