The Ability of Some Bacteria to Resist the Cytotoxic Effects

question 11

Multiple Choice

The ability of some bacteria to resist the cytotoxic effects of macrophages is most likely due to which of the following?

• A)they have high levels of flavohemoglobin that allows for the destruction of nitric oxide, a potent cytotoxic compound produced by macrophages
• B)they possess a protein called cytoglobin that causes macrophages to undergo apoptosis
• C)they have high levels of a myoglobin-like protein that tightly binds oxygen, preventing proper activity of the macrophage
• D)they possess the protein neuroglobin which enables them to specifically target nerve cells and thus evade macrophages
• E)none of the above

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Definitions:

Break-even Point

The level of sales or production at which total revenues equal total costs, resulting in neither profit nor loss.

Contribution Margin

The selling price of a product minus the variable cost per unit, used to cover fixed costs and contribute to net profit.

Fixed Costs

Expenses that do not change with the level of production or sales activities within a short time.

Variable Costs

Expenses which are dependent on the volume of activity within a business.