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: 28510

#Unit 5. Developmental Biology

which of the folllowing in turn function as positively feedback during limb bud formation? 

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#Question id: 27064

#Unit 1. Molecules and their Interaction Relevant to Biology

These are three amino structure acid given below choose the correct option regarding the stereochemistry of these fig. 

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#Question id: 26834

#Unit 10. Ecological Principles

A zone of junction or a transition area between two biomes called

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#Question id: 11248

#Unit 10. Ecological Principles

Which factor could not be considered a factor of environmental resistance?

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#Question id: 406

#Unit 1. Molecules and their Interaction Relevant to Biology

Hydrolysis of 1 M glucose 6-phosphate catalyzed by glucose 6-phosphatase is 99% complete at equilibrium (i.e., only 1% of the substrate remains). Which of the following statements is most nearly correct? (R = 8.315 J/mol·K; T = 298 K)