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20 which methods) is/are utilized by both p snd eukar expression? modeling Transcriptional control abave 21. Which environment favors expression of the lac operon: High glucose b. High gluc./low lact. Low gluc /high lac tow gec /low lact.

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Option c is correct. Lac operon expression in E. coli promotes the lactose metabolism. In the presence of high amount of lactose the RNA polymerase binds to the DNA at the promoter site and transcription proceeds, leading to the formation of three enzymes which metabolize lactose. Low amount of glucose favours lac operon because the concentration of cAMP and glucose is inversely proportional, hence when glucose level is low the cocentration of cAMP increases which bound to catabolite gene activator protein (responsible for binding of RNA polymerase to DNA promoter site). Hence low amount of glucose and high amount of lactose favours lac operon expression.

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