A Bacterium That You Isolated from Pond Water Appears to Use

question 32

Multiple Choice

A bacterium that you isolated from pond water appears to use light for energy. Based upon this information, you inoculate the organism into fresh media, infused with lots of carbon dioxide. Even after incubation at the correct temperature (of pond water) , the organism is not growing. Your best
Explanation of what might have happened is _______.

• A) there was no sulfur compound added to the medium, that could be used as an electron donor
• B) no oxygen was added to the medium so the organism died
• C) there is some inhibitory chemical that is preventing the growth of the bacterium
• D) you were using the wrong type of sunlight as the energy source for the bacterium

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Definitions:

Utility Function

A mathematical representation of how a consumer derives satisfaction or utility from consuming goods and services.

Substitution Effect

The economic principle that as prices rise (or incomes decrease), consumers will replace more expensive items with cheaper substitutes, holding utility constant.

Income

The amount of money received by an individual or household over a certain period, usually from employment or investments.

Price

The monetary figure anticipated, requisite, or paid as payment for a product.