A small molecule that binds to the repressor protein and makes it inactive is a/an ________.

• corepressor
• inducer
• promoter
• operator

A protein that binds to the operator and blocks the RNA polymerase

• regulator
• repressor
• activator
• corepressor

What is the name of the binding site of RNA polymerase in eukaryotes?

• operator
• operon
• inducer
• promoter

What does the repressor protein do?

• Allows RNA polymerase to read the gene
• Prevents RNA polymerase from reading the gene
• Reads the gene
• Translates the gene

Which type of operon is shown in the image?

• inducible operon
• repressible operon
• positive control operon
• can't determine this from the image

Operons are found in the cells of which of the following types of organisms?

• prokaryotes (bacteria)
• eukaryotes (plant and animals)
• animals only
• viruses

What is an operon?

• a part of the promoter region of a gene
• a part of RNA polymerase
• a unit made up of linked genes that code for proteins needed to do a specific task
• A protein needed for DNA replication

in a repressible operon, what turns on transcription?

• the presence of the corepressor
• the absence of the corepressor
• the presence of RNA polymerase
• the absence of RNA polymerase

In the lac operon, the genes within the operon will be expressed if:

• lactose is absent in the cell
• galactose is present in the cell
• lactose is present in the cell
• glucose is absent in the cell

What type of operon is the trp (tryptophan) operon?

• inducible
• repressible
• positive control
• promoible