Regulation of Gene Expression

The lac operon is…

• Inducible operon so starts off and is activated by lactose

• Inducible operon so starts on and is deactivated by lactose

• Repressible operon so starts off and is activated by lactose

• Repressible operon so starts on and is deactivated by lactose

Tags

NGSS.HS-LS3-1

The trp operon is a(n)…

• Inducible operon – activated by trp

• Inducible operon – deactivated by trp

• Repressible operon – activated by trp

• Repressible operon – deactivated by trp

When DNA is compacted by histones into 10 nm and 30 nm fibers, the DNA is unable to interact with proteins required for gene expression. Therefore, to allow for these proteins to act, the chromatin must constantly alter its structure. Which processes contribute to this dynamic activity?

• methylation and phosphorylation of histone tails

• nucleotide excision and reconstruction

What does the operon model attempt to explain?

• the coordinated control of gene expression in bacteria

• the mechanism of viral attachment to a host cell

Altering patterns of gene expression in prokaryotes would most likely serve the organismʹs survival in which of the following ways?

• allowing the organism to adjust to changes in environmental conditions

• organizing gene expression so that genes are expressed in a given order

• allowing environmental changes to alter the prokaryoteʹs genome

Tags

NGSS.HS-LS4-2

This can inhibit transcription by blocking the binding of positively acting transcription factors to the DNA:

• enhancer

• promoter

• repressor

Where does RNA polymerase bind to DNA?

• at an activator site

• on the coding gene sequence

• at a promoter region

• downstream of the coding sequence

• Where the RNA primer is placed

Which of the following is a mechanism by which eukaryotic cells regulate gene expression?

• RNA splicing

• DNA replication

• Protein folding

• Lipid synthesis

In the context of gene expression, what is the role of a promoter?

• To terminate transcription

• To initiate transcription

• To splice RNA

• To degrade mRNA

Which of the following is an example of post-transcriptional regulation of gene expression?

• RNA splicing

• DNA methylation

• Histone acetylation

• Protein degradation