Microbiology: Chapter 7
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- 1.Like all organisms, bacteria have both ______ and _______ requirements if they are to grow
- 2.Growth usually refers to the increase in which of these
- A.
Increase in the number of cells present
- B.
Increase in the size of cells
- 3.Which of these words describes when a cell is in an environment of its "best growth"
- A.
Optimum
- B.
Minimum
- C.
Maximum
- 4.Which of these words describes when a cell is in its lowest possible temperate environment in which it can still grow?
- A.
Optimum
- B.
Minimum
- C.
Maximum
- 5.Which of these words describes when a cell is in its highest temperate environment in which it can still grow?
- A.
Optimum
- B.
Minimum
- C.
Maximum
- 6.Can grow at 0 degrees C, optimum at <15 degrees. Are considered obligate with respect to cold. Live normally in arctic conditions.
- A.
Psychrotrophs
- B.
Mesophiles
- C.
Extreme (hyper) thermophiles
- D.
Thermophiles
- E.
Psychrophiles
- 7.Can grow at 0 degress C, optimum is about 20-30 degrees. Most important with food spoilage.
- A.
Psychrotrophs
- B.
Mesophiles
- C.
Extreme (hyper) thermophiles
- D.
Thermophiles
- E.
Psychrophiles
- 8.Optimal temperatures are 50-60 degrees C, and range from 40-70.
- A.
Psychrotrophs
- B.
Mesophiles
- C.
Extreme (hyper) thermophiles
- D.
Thermophiles
- E.
Psychrophiles
- 9.Optimal temperatures of 35-40 degrees C, range 10-50. They are the most common, most pathogens are this type.
- A.
Psychrotrophs
- B.
Mesophiles
- C.
Extreme (hyper) thermophiles
- D.
Thermophiles
- E.
Psychrophiles
- 10.Optimum temperatures are 80 degrees C or greater (usually archea). Found in volcanoes
- A.
Psychrotrophs
- B.
Mesophiles
- C.
Extreme (hyper) thermophiles
- D.
Thermophiles
- E.
Psychrophiles
- 11.Which are the only two types of bacteria that humans come into contact with normally?
- A.
Thermophiles and Psychrophiles
- B.
Extreme thermophiles and Psychrotrophs
- C.
Mesophiles and Psychrotrophs
- D.
Thermophiles and Extreme thermophiles
- 12.Most bacteria thrive in a neutral pH, some are called acidophiles whose optimal pH can be as low as what?
- A.
2
- B.
3
- C.
4
- D.
1
- 13.Halophiles are a type of bacteria that can exist in this type of condition.
- A.
Hypertonic
- B.
Hypotonic
- C.
Isotonic
- 14.The chemical need for ammonia, nitrate, or nitrite is found within
- A.
Hetertrophs
- B.
Autotrophs
- C.
Nitrogen fixers
- 15.The chemical need for atmospheric nitrogen (N2) is normally found within
- A.
Hetertrophs
- B.
Autotrophs
- C.
Nitrogen Fixers
- 16.This chemical requirement, phosphorous, is taken in with inorganic phosphate (PO4^(-3))
- A.
Hetertrophs
- B.
Autotrophs
- C.
Nitrogen Fixers
- 17.The need for oxygen to live is an....
- A.
Obligate aerobe
- B.
Facultative anaerobe
- C.
Obligate anaerobe
- D.
Aerotolerant anaerobes
- E.
Microaerophiles
- 18.May use oxygen if present, but can exist without it (fermentation). This is an
- A.
Obligate aerobe
- B.
Facultative anaerobe
- C.
Obligate anaerobe
- D.
Aerotolerant anaerobes
- E.
Microaerophiles
- 19.Cannot tolerate oxygen. This is an example of
- A.
Obligate aerobe
- B.
Facultative anaerobe
- C.
Obligate anaerobe
- D.
Aerotolerant anaerobes
- E.
Microaerophiles
- 20.Will not use oxygen, but it wont kill them. This is an...
- A.
Obligate aerobe
- B.
Facultative anaerobe
- C.
Obligate anaerobe
- D.
Aerotolerant anaerobes
- E.
Microaerophiles
- 21.Need oxygen, but only will grow under low oxygen concentrations (soil, water)
- A.
Obligate aerobe
- B.
Facultative anaerobe
- C.
Obligate anaerobe
- D.
Aerotolerant anaerobes
- E.
Microaerophiles
- 22.Superoxide dismutase is an enzyme that helps the conversion of which of these?
- A.
O2- > H2O2
- B.
H2O2 > H2O and O2
- C.
H2O2 > H2O
- 23.Catalase is an enzyme that aids in the conversion of which of these?
- A.
O2- > H2O2
- B.
H2O2 > H2O and O2
- C.
H2O2 > H2O
- 24.Peroxidase is an enzyme that aids in the conversion of which of these?
- A.
H2O2 > H2O and O2
- B.
O2- > H2O2
- C.
H2O2 > H2O
- 25.CULTURE MEDIA: Liquid
- A.
Culture is suspended in a liquid
- B.
Agar is poured into plates and solidifies, bacteria grow in colonies on the surface
- 26.CULTURE MEDIA: Solid
- A.
Culture is suspended in a liquid
- B.
Agar is poured into plates and solidifies, bacteria grow in colonies on the surface
- 27.Can cold kill bacteria?
- A.
Yes
- B.
No
- 28.Bacteria divide by which of the following?
- A.
Sexual reproduction
- B.
Budding
- C.
Binary Fission
- 29.Generation time is the time it takes for one cell to become
- A.
Two
- B.
Three
- C.
Four
- 30.Bacterial cells grow how?
- A.
Exponentially
- B.
Multiplication
- C.
Logarhithmically
- 31.This phase of growth has little growth, and high metabolic activity.
- A.
The lag phase
- B.
The log phase
- C.
The stationary phase
- D.
The death phase
- 32.This phase has exponential growth.
- A.
The lag phase
- B.
The log phase
- C.
The stationary phase
- D.
The death phase
- 33.In this phase the number of cells remains the same, because the rate of death equals the rate of growth.
- A.
The lag phase
- B.
The log phase
- C.
The stationary phase
- D.
The death phase
- 34.This phase has an exponential decline.
- A.
The lag phase
- B.
The log phase
- C.
The stationary phase
- D.
The death phase
- 35.In order to determine the number of bacterial cells present we must serially dilute the sample, and plate the dilution until a countable plate is reached. Then, count the colonies and multiply by the dilution factor.
- A.
True
- B.
False
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