Operon

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

• prokaryotes (bacteria)

• eukaryotes (plant and animals)

• animals only

• viruses

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

• inducible

• repressible

• positive control

• promoible

What type of operon is the lac (lactose) operon?

• inducible

• repressible

• positive control

• promoible

Where does the repressor in an operon bind?

• Operator

• Promoter

• Regulatory sequence

• TATA box

If the repressor is bound to the operator…

• RNA polymerase is able to bind, the operon is off

• RNA polymerase is able to bind, the operon is on

• RNA polymerase is unable to bind, the operon is off

• RNA polymerase is unable to bind, the operon is on

The lac operon is…

• Inducible operon so starts off and is activated by lactose

• Inducible operon so starts on and is deactivated by lactose

• Repressible operon so starts off and is activated by lactose

• Repressible operon so starts on and is deactivated by lactose

What types of cells have operons? 

• Eukaryotes

• Prokaryotes

• Neither eukaryotes nor prokaryotes

• Both eukaryotes and prokaryotes

The trp operon is a(n)…

• Inducible operon – activated by trp

• Inducible operon – deactivated by trp

• Repressible operon – activated by trp

• Repressible operon – deactivated by trp

what is an operon?

• a part of a ribsome

• a long piece of mRNA for several proteins

• a unit of DNA containing linked genes that code for proteins needed to do a specific task

• sequence of DNA needed for DNA replication

What is the name of the stretch of DNA on an operon where RNA polymerase binds to initiate transcription?

• operator

• promoter

• enhancer

• origin