micro ch 6 hw

false

During the stationary phase, binary fission stops.

biofilm

which term describes a mixed community of microbes attached a surface and to one another?

the deep oceans

A barophile would grow best in _____

salt lakes

A halophile would grow best in ____

oxygen

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

lag phase

Adjustment period during which cells are dividing slowly while they adjust to growth conditions

psychrophiles

All of the following could find a location in or on body tissues suitable for growth except ___ anaerobes, psychrophiles, facultative anaerobes, mesophiles, capnophiles

alkalinophile

An ______ is an organism that prefers alkaline ph (above 7)

obligate aerobe

An organism that cannot grow without oxygen is a(n) _____

obligate anaerobe

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

facultative anaerobe

An organism that respires using oxygen when it is present but can switch to an alternative anaerobic pathways when it is absent is a(n) ____

A

Assess the following population growth curves, and answer the questions below regarding bacterial growth under certain environmental conditions. Which of the growth curves represents an obligate aerobe grown in the presence of oxygen?

Psychrophile

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, very slight growth out on the bench top, and abundant growth at refrigeration. What term could be used for this species?

Exponential growth phase and stationary growth phase

During which stages of bacterial growth is an infected patient most at risk of spreading the organism to others?

mesophiles

Human pathogens fall into the group termed __

true

If the doubling time of a bacterium is short, the x-axis of a population growth curve will have smaller numbers.

false

If you measure turbidity using a spectrophotometer during the death phase, the turbidity will be much lower than it was during the exponential phase.

lag phase

NCLEX Prep—Test Bank Question: Please read the clinical scenario, and then answer the questions that follow to become familiar with the traditional NCLEX question format. The hospital infectious disease team is involved with the study of a healthcare-associated infection that has spread to 10% of inpatients. The infected patients are exhibiting symptoms of severe abdominal cramping, diarrhea, nausea, and vomiting. The RN on the infectious disease team provides education to staff regarding the pattern of bacterial growth and methods of infection control. The period of growth between inoculation and when the cells adjust to their environment and begin growth at their maximum rate is called the ____

death phase

Nutrient depletion and waste accumulation prevent cell growth and cells die exponentially

exponential growth phase

Phase during which cells are growing very quickly, at their maximum rate of cell division

stationary growth phase

Phase during which nutrient depletion and accumulation of wastes begin to slow cell growth such that the rate of cell increase equals the rate of cell death

the cells are not reproducing

Same NCLEX Q as above: Which of the following is a characteristic of the death phase of bacterial growth?

Exponential growth phase

Same NCLEX Q as above: The most rapid increase in bacterial growth occurs during which of the following stages?

It is most effective to treat patients with antimicrobials in the exponential growth phase.

The RN educates the staff about the importance of timely symptom recognition and treatment of the infection. Which of the following statements by a hospital provider demonstrates a proper understanding of antimicrobial agents?

minimum

The _______ temperature is the lowest temperature at which an organism will grow

exponential

The_______ phase of growth will continue as long as cells have adequate nutrients and the environment is favorable.

flow cut-meter, and Coulter counter

WOTF are methods that count cells as they pass through a type of automated scanner?

There is lag phase before growth occurs at a level that is visible in the broth

When you inoculate a fresh tube of broth medium, it doesn't instantly turn cloudy. Why is this?

A

Which of the growth curves represents a facultative anaerobe grown in the presence of oxygen?

osmophile

Which term describes a microbe that grows in hypertonic environments?

halophile

Which term describes bacteria that require or tolerate high concentrations of salt?

Lag

______ phase is when a bacterial cell is placed into a new environment and cell division is slow

symbiosis

___________ is a close nutritional association between individuals from two species that may be helpful, harmful, or neither to both members.

osmophile

a ________ is a microorganism that thrives in any hypertonic medium

whether the cells in a samples are alive; the number of cells in a sample

a flow cut-meter can provide which of the following types of data?

commensalism

a relationship between two organisms where one organism benefits and the other is unharmed

acidophile

an _____ is an organism that prefers acidic PH (below 7)

16

assuming you start with just one microbe and it could divide every 30 minutes, how many microbes would you have after 2 hours?

nutrients are limited and waste produces are not removed

growth of a bacterial culture medium in a test tube is defined as a sled culture, meaning that...

thermo

microorganisms that prefer hot environments are termed ______-philes (45 to 80C)

c, a, d, b

place the following steps ignorer to demonstrate understanding of the viable plate count. a: incubate the brother for a set time period b: incubate all plates and count the colonies that develop c: place a small number of cells into a sterile broth d: take a sample from the broth and plate onto solid media

B

same pic as #1: Which of the growth curves represents an aerotolerant anaerobe grown in the presence of oxygen?

c

same pic as #1: Which of the growth curves represents an obligate anaerobe grown in the presence of oxygen?

maximum

the _________ temperature is the highest temp at which an organism will grow

heat, cold, gases, PH, radiation, osmotic and hydrostatic pressures, and effects of other microbes

what environmental factors have an influence on microbial growth?

optimal temperature

what term is sued to describe the "best" temperature to support a microbes growth?

turbidity

what term is used to describe the cloudiness of a broth culture?

psychrophile

which term describes a microorganisms that thrives and divides under refrigeration conditions?

symbiosis

which term describes any close nutritional relationship between two organisms?