8.6 Notes on Wayground

Open Ended

Why is the regulation of gene expression important in both prokaryotic and eukaryotic cells?

Multiple Choice

Which of the following best describes an operon in prokaryotic cells?

• A group of genes regulated together, including a promoter and operator

• A single gene that codes for a protein

• A segment of DNA that is never transcribed

• A protein that binds to DNA to turn genes on

Multiple Choice

Which of the following best describes the function of the lac operon in the presence and absence of lactose?

• The lac operon is on when lactose is present and off when lactose is absent.

• The lac operon is always on regardless of lactose presence.

• The lac operon is off when lactose is present and on when lactose is absent.

• The lac operon only functions in eukaryotes.

Open Ended

Describe the differences between gene regulation in prokaryotes and eukaryotes based on the lac operon and regulatory sequences.

Fill in the Blanks

Most eukaryotes have a

box promoter.

Open Ended

Explain how regulatory DNA sequences and protein transcription factors control gene expression in eukaryotes.

Multiple Select

Which of the following are steps involved in mRNA processing in eukaryotes?

• Removal of introns

• Addition of a cap

• Addition of a tail

• Replication of DNA

Open Ended

Reflecting on what you learned about gene expression regulation, how do you think the ability to turn genes on and off benefits an organism?

Multiple Choice

What is the role of a promoter in gene expression regulation in prokaryotic cells?

• It allows a gene to be transcribed

• It turns a gene off

• It codes for enzymes

• It breaks down lactose