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Exam 7: Microbial Nutrition, Ecology, and Growth

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Question 21

Multiple Choice

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Organisms that feed on dead organisms for nutrients are called

A) saprobes.
B) parasites.
C) autotrophs.
D) lithoautotrophs.
E) phototrophs.

F) B) and D)
G) B) and E)

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Question 22

True/False

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Most microorganisms on Earth can only live and survive in habitats that are similar to human body conditions.

A) True
B) False

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Question 23

Multiple Choice

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The phase of the bacterial growth curve during which microbial growth slows and the rate of multiplication equals the rate of cell death is the

Which of the following is an important mineral ion of the cytochrome pigments used in cellular respiration?

A closed culture system is used to determine a population growth curve.

Saprobes do not need a carbon source for growth and metabolism.

A microorganism that has an optimum growth temperature of 37°C, but can survive short exposure to high temperatures is called

Cultures of a bacterial species were incubated on the shelf of a refrigerator, out on a lab bench top, on the shelf of a 37°C incubator and on the shelf of a 50°C incubator. After incubation, there was no growth at 37°C and 50°C, slight growth out on the bench top and abundant growth at refrigeration. What term could be used for this species?

The movement of molecules from an area of high concentration to an area of lower concentration is called

What type of media is used to demonstrate oxygen requirements of microbes?

Which term refers to the diffusion of water through a semipermeable membrane?

Anaerobes can be cultured in a CO₂ rich environment, as long as O₂ gas is excluded.

Cyanobacteria live in aquatic environments and are photosynthetic. The aquatic environment is their __________ and their role as a primary producer is their ____________.

Planktonic bacteria are more susceptible to antibiotics as compared to biofilm microorganisms.

When microbes in close nutritional relationship and one benefits but the other is not harmed, it is called

Lithoautotrophs use inorganic nutrients for carbon and energy sources.

An organic nutrient that cannot be synthesized by the organism and must be provided is called a/an

An organism that cannot tolerate any oxygen gas in its environment is an)

Transverse binary fission results in 4 daughter cells from 1 parent cell.

The direct cell count, using a flow cytometer, can determine both viable cell numbers and number of dead cells in the sample.