Exam 3 Ch 5, 8 & 9

Front

What does the repressor bind to in order to inhibit transcription?

Back

The repressor binds to the operator.

Front

Where does transcription occur in bacteria?

Back

Transcription occurs in the cytoplasm of bacteria, not the nucleus.

Front

Is the inducible operon normally on and must be turned off?

Back

False, the inducible operon is normally off and must be turned on.

Front

What is the region of DNA responsible for producing the repressor called?

Back

The region of DNA responsible for producing the repressor is known as the regulator.

Front

What is the start site of transcription?

Back

The start site of transcription is the promoter, not the origin of replication.

Front

Define 'operator' in the context of gene regulation.

Back

The operator is a segment of DNA where a repressor can bind to inhibit transcription.

Front

What is the function of RNA polymerase?

Back

RNA polymerase is an enzyme that synthesizes RNA from a DNA template during transcription.

Front

What is the difference between an inducible operon and a repressible operon?

Back

An inducible operon is usually off and can be turned on, while a repressible operon is usually on and can be turned off.

Front

What role do structural genes play in an operon?

Back

Structural genes code for proteins that are involved in metabolic pathways.

Front

What is the significance of the promoter in transcription?

Back

The promoter is the DNA sequence where RNA polymerase binds to initiate transcription.