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Exam 7: Microbial Nutrition, Ecology, and Growth

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Question 31

Multiple Choice

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A barophile would grow best in

A) acid pools.
B) deep oceans.
C) hot geyser springs.
D) arid,desert soil.
E) salt lakes.

F) None of the above
G) D) and E)

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Question 32

Multiple Choice

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

A) facilitated diffusion.
B) diffusion.
C) active transport.
D) osmosis.
E) endocytosis.

F) A) and E)
G) C) and D)

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Question 33

Multiple Choice

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A bacterium is inoculated into a tube of nutrient broth and incubated.After incubation,it appears turbid throughout,top to bottom,with the most amount of turbidty at the very top.This bacterium would be called a:

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

Cultures of a bacterial species were incubated in a standard incubator,in an anaerobic jar,and in a candle jar.After incubation,there was moderate growth of cultures in the candle and anaerobic jars,but heavy growth of the culture in the incubator.This species is a/n

What is the difference between mutualism and synergism?

Which of the following require the cell to use ATP?

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

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

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

Growth factors

A saprobe with a cell wall will utilize extracellular digestion.

An organism that cannot grow without oxygen is a/n

Cultures of a bacterial species were incubated on the shelf of a refrigerator (5^oC) ,out on a lab bench top (22^oC) ,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 in the refrigerator,and abundant growth on the lab bench top.What term could be used for this species?

Whether an organism is a phototroph or a chemotroph depends on its source of energy.

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

The time it takes for a freshly inoculated agar culture to develop visible colonies is primarily governed by the generation time of that species.

Which of the following is not a major element of a microbial cell?

What compound has the highest concentration in a cell?

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