Gene Expression Lesson

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

Inducible negative control is when when the gene is transcribed by the ____ of a specific molecule

• presence
• absence

Repressible negative control is when when the gene is transcribed by the ____ of a specific molecule

• presence
• absence

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

• inducible
• repressible
• positive control
• promoible

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-LS3-2

The most important sequence in promoter for RNA polymerase II is 

• -10 sequence 
• -35 sequence
• TATA box
• Spacer sequence

What enzyme transcribes eukaryotic mRNA?

• RNA Polymerase
• RNA Polymerase I
• RNA Polymerase II
• RNA Polymerase III