Question

Write the different components of a lac-operon in E. coli. Explain its expression while in an ‘open’ state.

Answer 1

Lac operon contains sites like promoter, repressor, operator, and enzyme sites.

Explanation:

• Lac operon is the operon which controls the expression of genes producing the lactase enzymes.

• This operon contains some sites like Promoter, Repressor, Operator and Enzymes.

• The promoter site is for attachment of DNA dependent RNA polymerase which transcripts the DNA to RNA.

• The repressor part of operon produces repressor protein which joins with the operator site in absence of lactose.

• The operator site presents joint for repressor protein which when joins, stops the transcription.

• The enzyme sites are those sites which presents genes for Lactase enzymes.

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Describe the lac operon and how it controls the metabolism of of lactose. support your answer with clear and well labelled diagrams