What Is the Role of Cis-Acting and Trans-Acting Factors in Transcription

question 48

Essay

What is the role of cis-acting and trans-acting factors in transcription? Explain how these factors play a role in the lac operon,and discuss how complementation can be used to identify where the mutations have occurred (structural genes versus regulatory regions).Which type of mutations can be complemented by a second gene with normal function? Are Iˢ and Oᶜ mutants cis or trans-acting?

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Definitions:

Contribution Margin

The profit remaining after variable costs have been subtracted from revenue, indicating how much contributes to covering fixed costs and generating profit.

Variable Cost

Variable costs are expenses that change in proportion to the activity of a business, such as materials and labor costs.

Fixed Manufacturing Overhead

Consists of production costs that do not change with the volume of manufacturing activity, such as rent for the manufacturing facilities or salaries of plant managers.

Deferred

Postponed or delayed, often referring to expenses or revenues that are recognized at a date later than when they were incurred or earned.