L 14.3 Gene Regulation and Expression Quiz

What is the function of an operon?

• Produce proteins

• Transport lactose

• Break down glucose

• Regulate genes together

What is the role of the TATA box in eukaryotic genes?

• Code for liver enzymes

• Regulate gene expression

• Help position RNA polymerase

• Activate other genes

What happens when lactose is present in a bacterium?

• The lac genes are turned off by regulatory proteins

• The lac repressor binds to the O region

• The lac genes are turned on by regulatory proteins

• RNA polymerase cannot reach the lac genes

What are transcription factors responsible for in gene regulation?

• Pack chromatin

• Control the expression of genes

• Block transcription

• Enhance translation

What is the purpose of cell differentiation in multicellular organisms?

• Regulate gene expression

• Produce RNA molecules

• Break down proteins

• Develop specialized cells

What do Homeotic Genes regulate?

• The stability of mRNA

• The exit of mRNA molecules from the nucleus

• Organs that develop in specific parts of the body

• The breakdown of protein products

How do environmental factors influence gene expression?

• Pack chromatin

• Enhance translation

• Block transcription

• Regulate gene expression

What is the effect of methyl groups on chromatin?

• Enhance translation

• Block transcription

• Open up chromatin

• Cause chromatin to condense

What do Hox genes determine in fruit flies?

• The identities of each body segment

• The breakdown of protein products

• The stability of mRNA

• The exit of mRNA molecules from the nucleus