Pre-test 6 Microbiology (Microbial Growth)

20 Questions | By Fabiounsoed | Updated: Mar 22, 2022 | Attempts: 5791

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Pre-test 6 Microbiology (Microbial Growth) - Quiz

B1J007009 CUCU KUSMAYANTI 1)60 2)60 3)70 4)60 5)100 B1J007013 SWASTIKA OKTAVIA 1)50 2)50 3)100 4)60 5)100 B1J007031 MAULIDA IKAWATI 1)70 2)50 3)30 4)70 5)100 B1J007035 DIAH ASTA PUTRI 1)80 2)90 3)100 4)90 5)100 B1J007083 IBADURRAHMAN EL FIRDAUS 1)50 2)70 3)80 4)60 5)100 B1J007091 LISA DWI FANESIA 1)60 2)50 3)90 4)80 5)100

Questions and Answers

1.

Which of the following is used to grow bacterial cultures continuously?
- A.
  
  Chemostat
- B.
  
  Coulter Counter
- C.
  
  Hemostat
- D.
  
  Petroff-Hausser chamber
- E.
  
  Bacteria cannot be grown in continuous culture
2.

An organism is completely dependant on atmospheric O2 for growth. This organism is a(n)
- A.
  
  Osmotolerant
- B.
  
  Acidophile
- C.
  
  Facultative anaerobe
- D.
  
  Aerotolerant anaerobe
- E.
  
  Obligate aerobe
3.

An organism has an optimal growth rate when the hydrogen ion concentration is very high. This organism is a(n)
- A.
  
  Osmotolerant
- B.
  
  Acidophile
- C.
  
  Neutrophile
- D.
  
  Aerotolerant anaerobe
- E.
  
  Alkalophile
4.

The term facultative anaerobe refers to an organism that _________
- A.
  
  Doesn't use oxygen but tolerates it
- B.
  
  Is killed by oxygen
- C.
  
  Uses oxygen when present or grows without oxygen when oxygen is absent
- D.
  
  Requires less oxygen than is present in air
- E.
  
  Prefers to grow without oxygen
5.

The term obligate anaerobe refers to an organism that ______________
- A.
  
  Doesn't use oxygen but tolerates it.
- B.
  
  Is killed by oxygen.
- C.
  
  Uses oxygen when present or grows without oxygen when oxygen is absent.
- D.
  
  Requires less oxygen than is present in air.
- E.
  
  Prefers to grow without oxygen.
6.

A microbiology student noticed that a culture broth tube was very turbid at the surface but clear throughout the rest of the tube. She can conclude that the ____________
- A.
  
  Organism are aerobes.
- B.
  
  Organism should be grown in an anaerobic chamber.
- C.
  
  Organism cannot produce superoxide dismutase and/or catalase.
- D.
  
  Organism cannot tolerate oxygen.
- E.
  
  Broth is sterile.
7.

Growth is defined as an increase in cellular constituents and may result in an increase in a microorganism’s size, population number , or both
- A.
  
  TRUE
- B.
  
  FALSE
8.

A wide variety of techniques can be used to study microbial growth by following changes in the total cell number, the population of viable microorganisms, or the cell mass.
- A.
  
  TRUE
- B.
  
  FALSE
9.

Population growth is usually analyzed in a closed system called a ____________
- A.
  
  Batch culture
- B.
  
  Direct count methods
- C.
  
  Viable cell counts
- D.
  
  Colony forming units (CFU)
- E.
  
  Continuous culture
10.

Mean growth rate constant is the number of generations per unit time, often expressed as generations per hour.
- A.
  
  TRUE
- B.
  
  FALSE
11.

Aerotolerant anaerobes are microorganisms that grow equally well whether or not oxygen is present.
- A.
  
  TRUE
- B.
  
  FALSE
12.

Barotolerant are organisms that can grow and reproduce at high pressures but do not require them.
- A.
  
  TRUE
- B.
  
  FALSE
13.

Batch culture is a culture of microorganisms produced by inoculating a closed culture vessel containing a single batch of medium.
- A.
  
  TRUE
- B.
  
  FALSE
14.

Chemostat is a continuous culture apparatus that feeds medium into the culture vessel at the same rate as medium containing microorganisms is removed.
- A.
  
  TRUE
- B.
  
  FALSE
15.

Continuous culture system is a culture system with constant environmental conditions maintained through continual provision of nutrients and removal of wastes.
- A.
  
  TRUE
- B.
  
  FALSE
16.

Extremophiles are microorganisms that grow under harsh or extreme environmental conditions such as very high temperatures or low pHs.
- A.
  
  TRUE
- B.
  
  FALSE
17.

Generation time is the time required for a microbial population to double in number.
- A.
  
  TRUE
- B.
  
  FALSE
18.

Alkalophile is a microorganism that requires high levels of sodium chloride for growth.
- A.
  
  TRUE
- B.
  
  FALSE
19.

Lag phase is a period following the introduction of microorganisms into fresh culture medium when there is no increase in cell numbers or mass during batch culture.
- A.
  
  TRUE
- B.
  
  FALSE
20.

Thermophile is a microorganism with a growth optimum around 20 to 45°C, a minimum of 15 to 20°C, and a maximum about 45°C or lower.
- A.
  
  TRUE
- B.
  
  FALSE