An Operon That Would Be Controlled by Both Presence of Lactose

question 133

Short Answer

An operon that would be controlled by both presence of lactose and low levels of glucose would need two control mechanisms: first, a(n) _______ system to turn on genes to use lactose when it is present, and then a positive regulation system to only turn on lactose metabolism genes in the absence of glucose.

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Definitions:

Variable Costs

Costs that vary directly with the level of production or the volume of services provided.

Variable Costs

Variable costs are expenses that change in proportion to the activity of a business, such as costs for raw materials or production supplies.

Break-even Point

The production level or sales volume at which total revenues equal total costs, resulting in no profit or loss.

Variable Costs

Costs that vary directly with the level of production or the volume of output.