Bacterial genomes frequently contain groups of genes organized into operons. Wha

Question

Bacterial genomes frequently contain groups of genes organized into operons. What is the biological advantage of operons to bacteria? Operons afford the organism the opportunity to simultaneously regulate transcription of multiple genes, whose products are active in the same process. Operons provide redundancy in proofreading the most essential parts of genetic code, thereby reducing the susceptibility of the organism to lethal mutations. Operons significantly increase the rate of DNA replication, thereby ensuring the required rate of bacteria reproduction. Promoters and repressors as parts of operons serve as information integrating units, thereby affording more flexible response to the environmental changes. Identify the cis regulatory components you would expect to find in an operon. Select the three correct regulatory components. repressor promoter operator attenuator regulator inducer How are the expressed genes of an operon usually arranged? The expressed genes are located in two groups before and after the regulatory region of the operon. The expressed genes are located one by one after the regulatory region of the operon. The expressed genes are located one by one before the regulatory region of the operon. The expressed genes are located in the regulatory region of the operon.

Explanation / Answer

Part A. Option 1 is the right answer

Part B. Option 2, 3 and 5 or 1 (promoter, operator and regulator in Lac operon and attenuator in Trp operon) is the right answer. Normally enhancers are also cis-regulatory elements.

Part C. Option 2 is the right answer (located after regulatory region of operon)

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