In lac operon,the lac mRNA (1)Has several initiation and termination codons (2)Forms four different enzymes (3)Is not transcribed in the presence of lactose (4)Is involved in an anabolic reaction
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operon,the lac mRNA (1) Has several initiation and termination codons (2) Forms four different enzymes (3)Is not transcribed in the ...
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Answer: The correct answer is option A
Explanation: The lac operon is a catabolic process and it breakdowns the lactose to form glucose and galactose amongst which the lactose is disaccharides and glucose and galactose are monosaccharides and they both together form the lactose so as breakdown is taking place it is not anabolic but catabolic process and to do this breakdown four enzymes are required and they are beta-galactosidase then permease and then transacetylase which is released from z y and a respectively and in the presence of lactose it acts as an inducer and induces the process by blocking the repressor so it makes iR inactive so repressor will not be able to block the operator so that transcription of mRNA will take place and also lac operon will start working and as only 3 enzymes are involved so the first answer becomes correct as several termination and initiation codons are like inducers repressors and operators or enzymes and they helps the bacterias to gain energy in presence and absence of lactose from the environment.
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