13.4 Bio

what is an operon?

• a part of a ribsome
• a part of a Rna
• a unit made up of linked genes that code for proteins needed to do a specific task
• needed for dna replication

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

• regulator
• repressor
• activator
• corepressor

The "on/off" switch for an operon is called the

• promoter
• repressor
• operator
• gene

The lac operon genes only become expressed if:

• lactose binds to the repressor
• glucose binds to the repressor
• lactose binds to the operator
• the repressor binds to the operator

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

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

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

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

How can a person's muscle cells have the same exact DNA sequences as their nerve cells even though the look and perform completely different?

• The two different cells become mutated
• The proteins expressed in each cell are different
• They actually have different DNA in the two types of cells.
• The genome of the different cells changes

Tags

NGSS.HS-LS1-1

NGSS.HS-LS1-4

The "on/off" switch for an operon is called the _________.

• promoter
• repressor
• operator
• gene

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

What is a Gene?

• A segment of RNA that codes for a protein
• A chromosome
• A segment of DNA that codes for a protein
• Your genome