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Lactose Operon (lac operon) in E. coli and Enteric Bacteria

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Lactose Operon (lac operon) in E. coli and Enteric Bacteria

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Questions and Answers

What is the main function of the lac operon in E. coli and other enteric bacteria?

Transport and metabolism of lactose (correct)

Synthesis of nuclear membrane

Transport and metabolism of glucose

Gene regulation of DNA replication

What is the role of beta-galactosidase in the lac operon?

Synthesis of nuclear membrane

Digestion of lactose (correct)

Digestion of glucose

Preventing gene regulation

Why is the lac operon often discussed in introductory molecular and cellular biology classes?

Due to its role in protein synthesis

Due to its role in glucose metabolism

Due to its role in DNA replication

Due to its role in gene regulation (correct)

What did François Jacob and Jacques Monod use the lactose metabolism system for?

To determine how a biological cell knows which enzyme to synthesize Signup and view all the answers

At what level does gene regulation by lac operon occur in bacterial cells including E. coli?

Transcriptional level Signup and view all the answers

What type of transcripts are bacterial operons like the lac operon able to produce?

Polycistronic transcripts Signup and view all the answers

What is the function of the gene product of lacZ?

Cleaves lactose into glucose and galactose Signup and view all the answers

What is the function of the gene product of lacY?

Transports lactose into the cell Signup and view all the answers

What is the function of the gene product of lacA?

Transfers an acetyl group from acetyl-CoA to thiogal Signup and view all the answers

What is the role of lacI in the absence of lactose?

Halts production of enzymes and transport proteins Signup and view all the answers

What happens when lactose is available but not glucose?

Lac operon is expressed Signup and view all the answers

What effect does the presence of glucose have on the lac operon?

Enzymes encoded by lacZ and lacA are repressed Signup and view all the answers