Pure monopoly is characterized by（）
A. one firm, with no competitors, that produces a product with no close substitutes
B. many firms that produce a homogeneous product
C. many firms that produce slightly different products that are close substitutes
D. such a small number of firms that each must figure out how the others will respond to its own actions
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An increase in a monopolist’s average cost will lead to（）
A. an increase in price only if marginal cost also increases
B. an increase in price, as the monopolist passes on the price increase
C. a decrease in price as the monopolist needs to sell more in order to cover increased costs
D. an increase in price only if the elasticity of demand is less than 1
A decrease in the price of pizza will（）
A. decrease the quantity of pizza demanded
B. increase the quantity of pizza demanded
C. decrease the demand for pizza
D. increase the demand for pizza
The following ____ is the function of the bacterial capsule（）
A. Store carbon sources
B. Store phosphorus
C. Store energy
D. Anti-drying
E. Anti-chemical agents
Bacterial flagella is composed of several parts（）
A. Flagella
B. Hair follicle
C. Matrix
D. Hook sheath
E. Fiber tube
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