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Exam 7: Microbial Nutrition, Ecology, and Growth

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Question 21

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The term phototroph refers to an organism that

A) Uses CO₂ for its carbon source
B) Must obtain organic compounds for its carbon needs
C) Gets energy from sunlight
D) Gets energy by oxidizing chemical compounds
E) Does not need a carbon source

F) A) and B)
G) B) and D)

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Question 22

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The phase of the bacterial growth curve in which the rate of multiplication equals the rate of cell death is the

A) Lag phase
B) Log phase
C) Stationary phase
D) Death phase
E) Telophase

F) B) and C)
G) A) and C)

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Question 23

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An organism that can exist in both oxygen and oxygen-less environments is a(n)

Inorganic nitrogen must be converted to ammonia to be used by a cell.

A microaerophile

Diffusion of water through a semi permeable membrane is called

The E. coli that normally live in the human large intestines and produce vitamin K that the body uses would be best termed a _____ relationship.

Microorganisms require large quantities of this nutrient for use in cell structure and metabolism

The movement of substances from lower to higher concentration across a semi permeable membrane that must have a specific protein carrier and cell expenditure of energy is called

The term autotroph refers to an organism that:

Whether an organism is an autotroph or heterotroph depends on its source of nitrogen.

Facilitated diffusion and active transport require a carrier protein to mediate the movement across the plasma membrane.

The majority of microbes live and grow in habitats between pH 7 and 9.

Obligate saprobes can adapt to a living host.

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 ^$\circ$ C incubator and on the shelf of a 50 ^$\circ$ C incubator.After incubation, there was no growth at 37 ^$\circ$ C and 50 ^$\circ$ C, slight growth out on the bench top and abundant growth at refrigeration.What term could be used for this species?

An organism that cannot tolerate an oxygen environment is a(n)

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

Which of the following microorganisms would find hypotonic conditions most detrimental?

What compound has the highest concentration in a cell?

A microorganism that does not have catalase or superoxide dismutase would find it difficult to live in an environment with