Genetics, please help. 6 ) An E. coli strain possesses the following phenotype F

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Genetics, please help.

6 ) An E. coli strain possesses the following phenotype F(0°/ IP-O-ZY where O® is a mutation in the operator that prevents repressor binding. The structural genes on the chromosome A will be transcribed in the presence and absence of lactose ? will be transcribed only if lactose is present will not be transcribed under any conditions MOA ( ) The leukemia associated with the Philadelphia chromosome is the result of a hybrid gene produced from A an inversion a translocation a duplication a deletion an unequal crossing over 8 ( A circular plasmid DNA is cut to completion with three different restriction enzymes generating the following sizes: EcoRI 5 kb BamHI 5kb, 3kb, 2kb HinDIII Skb. 4kb, 1kb The size of the uncut plasmid is 5kb 4kb 3kb 2kb ? none of the above MUA The following diagram shows a fragment of transcribed DNA, the upper strand is the template strand: 5'ATTGCC3 3'TAACGG5 The transcribed RNA can be represented by: 5'AUUGCC3 5'TAACGG3 5'UAACGG3 5'GGCAAU3 A ( ) Reverse transcriptase makes

Explanation / Answer

All the structural genes will be transcribed in the presence and absence of lactose.

What happens in Lac operon:

The lactose molecule binds to the repressor protein. Once the lactose binds to repressor protein, the repressor leaves the Bacterial DNA, thereby activating the transcription process.

In this case, the operator has a mutation that prevents the repressor from binding. Hence, in the absence or presence of lactose, all the genes will be transcribed since there is no repressor molecule to control the transcription process.

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