Mutations in region b and region d give the same results - when either of these regions is mutated, the operon is expressed under all conditions (called constitutive expression). you hypothesize that region b is the operator region and that region d is the repressor protein. to test your hypothesis, you create two partial diploid lines by introducing a f' plasmid with a wild-type lac operon: strain 1: f' a+ b+ c+ d+ e+ / a+ b- c+ d+ e+ strain 2: f' a+ b+ c+ d+ e+ / a+ b+ c+ d- e+ what experimental results would be predicted by your hypothesis?

The repressor region D generates a repressor protein, which combines with the operator region B, thus inhibiting the process of transcription. Hence, a mutated operator region will not be repressed by the repressor protein and the lac gene is articulated constitutively.  

A mutated repressor protein will not be able to combine with the operator region. Therefore, mutation of repressor and operator will result in the expression of the lac gene constitutively.  

In strain 1, a mutated operator region is present. Thus, repressor from F' will not possess the tendency to combine with the operator. Thus, the expression of the lac gene takes place constitutively. There is a sign for repressor, however, the enzyme is expressed.  

In strain 2, a mutated repressor protein is present, and a non-mutated repressor is generated by the F' plasmid. The mutated repressor will not combine with the operator and the articulation of the enzyme takes place, however, the non-mutated repressor protein from F' will combine with the operator and hence, will repress the expression of the gene. There is a sign for repression and the enzyme is repressed.  

transcription is a process in which information is rewritten. it is something our cells must do, in a more specialized and narrowly defined way. in biology, transcription is the process of copying out the dna sequence of a gene in the similar alphabet of rna. it needs to happen in the nucleus because that's where the dna is. dna is always inside the nucleus unless the cell is dividing.

transcription is the first step in gene expression, which involves copying a gene's dna sequence to make an rna molecule. transcription is performed by rna polymerases. it has three stages: initiation, elongation, and termination. rna molecules must be processed after transcription in eukaryotes.

explanation:

long version:

the protein synthesis consists two processes which are, transcription and translation. transcription takes place in the nucleus. it uses dna as a template to make an rna molecule. rna then leaves the nucleus and goes to a ribosome in the cytoplasm, where translation occurs. transcription is the first part of the central dogma of molecular biology: dna → rna. it is the transfer of genetic instructions in dna to messenger rna (mrna). during transcription, a strand of mrna is made that is complementary to a strand of dna.  

these three stages are:

  initiation: in which   is the beginning of transcription.occuring when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

    elongation: in which is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

    termination: in which is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.

the correct answer is d