The map of the lac operon is:    POZY   The promoter (P) region is the start site of transcription through...

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Chemistry

The map of the lac operonis:    POZY  

The promoter (P) region is thestart site of transcription through the binding of RNA polymerasebefore actual mRNA production. Mutationally altered promoters(P-) cannot bind RNA polymerase. Certainpredictions can be made about the effect of P- mutations. Use your predictions and yourknowledge of the lactose system to complete the following table.Insert a “+” where an enzyme is produced and a “-“ where no enzymeis produced. The first one has been done as an example.

Beta-galactosidase

Permease

No lactose

Lactose

No lactose

Lactose

I+P+O+Z+Y+/I+P+O+Z+Y+

-

+

-

+

I+P+O+Z-Y+/I+P-OCZ+Y+

I+P+O+Z+Y+/I+P+OCZ+Y-

I-P-O+Z+Y+/I-P+OCZ-Y+

I+P+O+Z+Y+/I+P+O+Z+Y+

I-P+OCZ+Y-/I+P+O+Z-Y+

I-P-O+Z+Y+/I+P+O+Z-Y+

ISP+O+Z+Y-/I+P+O+Z-Y+

I+P+O+Z+Y-/I+P+O+Z+Y-

Answer & Explanation Solved by verified expert
4.0 Ratings (729 Votes)

                                             No lactose Lactose No Lactose      Lactose        

I+P+O+Z-Y+/I+P-OCZ+Y+                  -                      +                     -                     +

I+P+O+Z+Y+/I+P+OCZ+Y-                 -                      +                     +                    -

I-P-O+Z+Y+/I-P+OCZ-Y+                   +                     + -    -

I+P+O+Z+Y+/I+P+O+Z+Y+                -                      +                     -                      +

I-P+OCZ+Y-/I+P+O+Z-Y+             +                      +                    -                      -

I-P-O+Z+Y+/I+P+O+Z-Y+                  +                     +                    -                       -

ISP+O+Z+Y-/I+P+O+Z-Y+            -    -     -    +

I+P+O+Z+Y-/I+P+O+Z+Y-            -                      +                     +                     +


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