Unit 6 - Topics 5 & 6 - Control of Gene Expression -Quick Review

Which of the following is a mechanism of transcriptional regulation?

• Alteration of DNA sequence

• Binding of transcription factors to DNA

• Modification of mRNA after transcription

• Degradation of mRNA

What is the role of microRNAs in gene expression?

• They enhance the transcription of specific genes

• They directly modify histones

• They degrade mRNA or block its translation

• They replicate DNA

Which of the following is an example of epigenetic control?

• Mutation in a gene

• Binding of a transcription factor

• DNA methylation

• RNA splicing

How do transcription factors regulate gene expression?

• By degrading mRNA

• By altering the DNA sequence

• By binding to specific DNA sequences

• By modifying histones

What is the effect of histone acetylation on gene expression?

• It decreases gene expression

• It increases gene expression

• It has no effect on gene expression

• It silences gene expression

Which process is involved in post-transcriptional regulation?

• DNA replication

• RNA splicing

• Histone modification

• DNA methylation

What is the consequence of DNA methylation in gene expression?

• It activates gene expression

• It has no effect on gene expression

• It silences gene expression

• It enhances RNA splicing

Which of the following is NOT a function of microRNAs?

• Enhancing mRNA stability

• Blocking mRNA translation

• Degrading mRNA

• Regulating gene expression

How does RNA splicing contribute to gene expression?

• By altering the DNA sequence

• By modifying histones

• By generating multiple mRNA variants from a single gene

• By degrading mRNA

Which of the following is a direct effect of histone methylation?

• It always activates gene expression

• It always represses gene expression

• It can either activate or repress gene expression, depending on the context

• It has no effect on gene expression