4a. The diagram below represents (a) the lac operon in the OFF state and (b) lac operon in the ON state. Assign labels to letters A-F based on known components in the pathway. The lac operon Орeron А. A B a) Absence of lactose Regulator Structural genes gene (lacl) lacZ lacY lacA В. Transcription and translation No transcription С. D. Е. b) Presence of lactose B F. Transcription and translation Transcription and translation Enzymes Permease Transacetylase Glucose B-Galactosidase Galactose Lactose 4b. Briefly describe the changes in gene expression that happen in the lac operon when lactose is present in the cell. Include changes in the action of RNA polymerase and the lac repressor protein.

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