You Add an Unknown Phage to a Mixture of F⁺

question 42

Multiple Choice

You add an unknown phage to a mixture of F⁺ and F− cells of E. coli and plate out the bacteria. The bacterial colonies that grow are all F−. How can you explain this phenomenon?

• A) The phage bound to a receptor on the sex pilus, and therefore only infected the F⁺ cells (leaving the F− cells alone).
• B) The phage bound to a receptor on the F− cells, leaving only them alive and allowing the F⁺ cells to die off.
• C) The phage integrated (lysogenized) the F− cells, giving them a selective advantage over the F⁺ cells.
• D) F⁺ cells are uniquely susceptible to phage attack for unknown reasons.
• E) F⁺ are well known to die in the presence of any type of bacteriophage.

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Grasp the implications of various trade controls (e.g., quotas, tariffs) on international trade.

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Understand the role of human resource management in supporting international business strategies and operations.

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Definitions:

Yield

The income return on an investment, such as the interest or dividends received from holding a particular security.

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The process where interest is added to the principal sum of a loan or deposit once a year.

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The increase or decrease in the value of an investment during a set timeframe, shown as a percentage of the investment's starting price.

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A collection of investments held by an individual or institution, including stocks, bonds, real estate, and other assets.