A 27-Year-Old Man Comes to the Emergency Department Due to Several

question 143

Multiple Choice

A 27-year-old man comes to the emergency department due to several hours of right foot pain and swelling.  The patient says he was working in his barn last night and stepped on an old nail.  This morning, he awoke with pain near the injury site.  It has increased throughout the day and is accompanied by progressive swelling.  The patient has no chronic medical conditions and takes no medications.  Temperature is 38.1 C (100.6 F) , blood pressure is 135/75 mm Hg, and pulse is 95/min.  The right foot is swollen with some erythema around the injury site.  Radiographic imaging reveals gas in the tissues.  Surgical exploration shows extensive tissue necrosis.  Culture from the site reveals gram-positive rods.  Which of the following best describes the mechanism of action of the toxin responsible for the necrotic effects seen in this patient?

• A)Actin depolymerization
• B)Carbohydrate degradation
• C)Elongation factor ribosylation
• D)Phospholipid splitting
• E)Plasminogen activation
• F)Presynaptic acetylcholine release inhibition
• G)T-cell hyperstimulation

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Definitions:

Increasing Cost Industry

An industry in which costs of production increase as firms enter the market, often due to limited resources or factors of production becoming more expensive.

Long-Run Supply Curve

A graphical representation that shows how the quantity supplied reacts to price changes in the long-term, accounting for all factors of production adjustments.

Increasing Cost Industry

An industry in which the costs of production increase as the industry's output expands, typically due to resource limitations.

Decreasing-Cost Industry

An industry where the average cost of production decreases as the industry's output increases, often due to economies of scale.