Pathogenic E

question 23

Multiple Choice

Pathogenic E.coli strain O157:H7 evolved from a non-pathogenic strain as a result of this genetic change.

• A)A mutation in a virulence gene.
• B)A mutation that resulted in antibiotic resistance.
• C)The acquisition of virulence genes from Shigella.
• D)The use of antibiotic supplements in animal feeds.
• E)A mutation that resulted in increased capsule production.

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Definitions:

Country

A defined geographic area or political unit acknowledged as a sovereign state.

Domestic Consumption

The total amount of goods and services consumed within a country's borders.

Tariff

A tax imposed on imported goods and services, designed to increase the price and reduce the demand for foreign products.

Imports

Goods or services brought into one country from another for sale or use.