Gene Expression in Prokaryotes

Which of these molecules gets translated?

• DNA
• mRNA
• tRNA
• amino acids

What enzyme is responsible for adding nucleotides to the growing RNA strand?

• DNA Polymerase
• RNA Primase
• RNA Polymerase
• Topoisomerase

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

what does a promoter do?

• it allows a gene to be transcribed
• it creates a DNA segment
• it is another word for ribosomes
• it is another word for RNA

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

• promoter
• repressor
• operator
• gene

If an mRNA molecule has introns and exons in it, where is it?

• At a ribosome
• In the nucleus
• In a prokaryotic cell
• could be in the nucleus or the ribosome

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

____ is the activation of a gene that results in transcription.

• Gene expression
• Gene technology
• Eukaryotic expression
• Prokaryotic expression

What is the name of the enzyme that controls Transcription?

• DNA Polymerase
• Gyrase
• Helicase
• RNA Polymerase