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Question : List any six features of genetic code. |
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Answer» Solution :Structural genes: .Z. for `beta` - gataclosidase, `gamma` for galactoside permease, .A. for galactosidetransacetylase. Regulatory gene - Regulator, promoter and operator Operon - off (SWITCH off) - in the absence of lactose in the medium regulator directs the SYNTHESIS of repressor protein that finds to operator. Operator gets repressed. RNA polymerase cannot bind to the promoter since a part of operator overlaps promoter. Structural genes are switched-off and therefore neither mRNA nor the ENZYMES are synthesized. Operor - On (switch on) - In the presence of lactose in the medium represent binds to lactose forming lactose-repressor complex.. Operator is derepresented RNA polymerase INTERACTS with the exposed promoter. Structural genes are switched on and therefore a polycistronic mRNA is synthesized followed by the synthesis of the enzymes. |
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