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Exam 7: Microbial Nutrition, Ecology, and Growth

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Question 31

Multiple Choice

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The decline in growth rate during the death phase is due to all of the following, except:

A) the depletion of nutrients.
B) the depletion of oxygen.
C) the excretion of biochemical pollutants.
D) the excretion of organic acids.
E) the decrease in temperature of the culture.

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

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Question 32

Multiple Choice

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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) All of the choices are correct.

F) None of the above
G) A) and B)

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Question 33

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The term autotroph refers to an organism that:

The toxic superoxide ion is converted to harmless oxygen by two enzymes: _____ and _____.

Cultures of a bacterial species were incubated on the shelf of a refrigerator, out on a lab benchtop, 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 benchtop, and abundant growth at refrigeration.What term could be used for this species?

Discuss the differences in growth requirements between a photoautotroph and a chemoheterotroph.

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

Bacteria have an average generation time of 24 hours.

Organisms depending on each for survival through time is coevoluion.

All microbiota interactions with humans are harmful.

All of the following could find a location in or on body tissues suitable for growth, except:

The phase of the bacterial growth curve in which newly inoculated cells are adjusting to their new environment, metabolizing but not growing is the:

Plant roots provide various growth factors for soil bacteria, and the bacteria help fertilize the plant by supplying it with minerals.This is an example of:

If a culture starts out with 1 cell and after 4 hours there are 64 cells, how many generations have occurred?

The movement of substances from higher to lower concentration across a semi-permeable membrane that must have a specific protein carrier but no energy expenditure is called:

Your professor asks you to set up a pure culture of a bacterial species she is researching.She tells you that this species is a fastidious, gram positive mesophile that does not have catalase or superoxide dismutase.It is a capnophile and a halophile.Describe the type of culture medium, culture techniques, and environmental factors that you will use to grow this organism, and explain why you have selected each one.

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

After binary fission, daughter cells will differ genetically.

An organism with a temperature growth range of 45°C to 60°C would be called a/an:

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.