Bacteriophage Lambda Enters the Lytic Phase of Its Life Cycle

question 43

Multiple Choice

Bacteriophage lambda enters the lytic phase of its life cycle when

• A)high levels of cI and high levels of cro proteins are present in bacterial cells
• B)low levels of cI and high levels of cro proteins are present in bacterial cells
• C)high levels of cI and low levels of cro proteins are present in bacterial cells
• D)low levels of cI and low levels of cro proteins are present in bacterial cells
• E)none of these conditions lead to lysis

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Definitions:

Contribution Margin

The amount remaining from sales revenue after all variable expenses are deducted, indicating how much contributes to covering fixed costs and generating profit.

Variable Costs

Costs that change in proportion to the level of production or sales activity within a business.

Fixed Costs

Expenses that do not change with the level of production or sales over a certain period, such as rent, salaries, and insurance.

Variable Costs

Costs that vary in direct proportion to changes in levels of production or sales.