You have isolated two mutations that show decreased expression of the Lac operon. However, unlike like the promoter mutations, these mutations don’t respond to the inducer IPTG. These mutations, designated Lac3– and Lac4–, are evaluated for the quantity of ß-galactosidase and permease activity expressed with or without IPTG:

 

Mapping experiments reveal that Lac3– and Lac4– are different short deletions located in the region before the start of the LacZ gene. Given the data shown above suggest which genetic element(s) in addition to part of the promoter has been deleted in each mutant. 

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#Question id: 15182

#SCPH06 I Botany

Which of the following types of effect are responsible for lowering the efficiency of electrophoresis?

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#Question id: 5555

#SCPH28 | Zoology

The formation of the fertilization envelope requires an increase in the cytosolic concentration of ________.

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#Question id: 3289

#SCPH06 I Botany

If, someday, an archaean cell is discovered whose SSU-rRNA sequence is more similar to that of humans than the sequence of mouse SSU-rRNA is to that of humans, the best explanation for this apparent discrepancy would be

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#Question id: 3683

#SCPH05 I Biotechnology

In some viruses, RNA serves as the storage of genetic materials and DNA is synthesized from RNA by the enzyme known as:

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#Question id: 11595

#SCPH06 I Botany

Paclobutrazol and other inhibitors of P450 monooxygenases specifically inhibit the stage of gibberellin biosynthesis