Gene Expression Quiz

What is gene expression?

• The process by which a gene is made into a functional product

• The process of gene mutation

• The process of gene deletion

• The process of gene duplication

Why are the majority of genes regulated?

• To ensure proteins are produced at the correct time and amount

• To ensure proteins are produced in excess

• To ensure proteins are never produced

• To ensure proteins are produced randomly

What is the role of constitutive genes?

• They have constant levels of expression in all conditions over time

• They are only expressed during cell division

• They are never expressed

• They are expressed only in response to environmental changes

What is the role of the Catabolite Activator Protein (CAP) in gene transcription?

• It inhibits the DNA double helix.

• It binds the DNA double helix to activate gene transcription.

• It degrades the DNA double helix.

• It replicates the DNA double helix.

What type of sugar can E. coli use as food?

• Glucose

• Lactose

• Fructose

• Sucrose

Which protein is responsible for transporting lactose into the cell in E. coli?

• β-galactosidase

• Lactose permease

• Amylase

• Protease

What happens to the production of proteins when lactose levels drop in E. coli?

• Proteins are produced in higher amounts

• Proteins are no longer made

• Proteins are made at a constant rate

• Proteins are made in smaller amounts

What is the role of β-galactosidase in E. coli?

• Transports lactose into the cell

• Breaks down lactose

• Synthesizes lactose

• Converts lactose to glucose

What happens first when lactose becomes available in the environment of E. coli?

• The bacterium degrades lactose proteins.

• The bacterium increases production of lactose permease and β-galactosidase.

• Lactose is transported into the cell.

• The bacterium uses lactose until it is gone.

Which enzyme is responsible for breaking down lactose in E. coli?

• Lactose permease

• β-Galactosidase

• DNA polymerase

• Lactase