Microbiology Final Exam
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Microbiology final exam
- 1.Bacterial growth phase where cellular division seems to have stopped or ceases for a period of time:
- A.
The Lag Phase
- B.
The Log Phase
- C.
The Stationary Phase
- D.
The Death Phase
- 2.
- A.
Nutrient broth
- B.
Nutrient agar
- C.
Defined media
- D.
Complex media
- 3.Protection against osmotic lyses is provided by:
- A.
The cellular plasma membrane
- B.
The cell wall
- C.
The cell's capsule
- D.
Lysosomes
- 4.Thermophiles develop at temperatures between:
- A.
-5 and 20C
- B.
40 and 80C
- C.
-5 and 35C
- D.
65 and 105C
- 5.Name associate to the presence of a cell wall and a capsule together in a bacterial cell:
- A.
The cytoplasmic membrane
- B.
The Envelop
- C.
The Capsule
- D.
The Cell Wall
- 6.Which group do strict anaerobes partner with to find an environmental condition optimal for growth?
- A.
Obligated aerobes
- B.
Aerotolerant anaerobes
- C.
Microaerophiles
- D.
Facultative anaerobes
- 7.What statement is not descriptive of the Log Exponential Phase
- A.
Population growth is uniform
- B.
Growth rate is constant
- C.
Cells exhibit balanced growth
- D.
It varies in length
- 8.What is Microbiology?
- A.
The study of organisms too small to be seen with the naked eye.
- B.
Organism or agents too small to be visible with the naked eye.
- C.
Microorganisms relatively simple in their construction.
- D.
Microorganism that become nutrients to other organisms.
- 9.Organelle responsible for the transport/delivery of ER products across different parts of the cell.
- A.
The Golgi complex
- B.
The Smooth ER
- C.
The Rough ER
- D.
The Nucleus
- 10.Bacterial growth phase where a maximal rate of cellular division is obtained:
- A.
The Lag phase
- B.
The Log phase
- C.
The Stationary phase
- D.
The Death phase
- 11.Contributes to the negative charge of Gram - bacteria:
- A.
Broun's lipoproteins
- B.
Porins
- C.
Teichoic acids
- D.
LPS
- 12.A Pure Culture:
- A.
Presents a mixture of microbial organisms
- B.
Can only be obtained by isolating the progeny of single cell
- C.
Was first created by the efforts of microbiologist Luis Pasteur
- D.
Can be obtained by growing bacteria in differential media
- 13.What statement describes bacteria that stains "pink" after a Gram stain:
- A.
Bacteria that have lost all crystal violet staining after gram's alcohol washing
- B.
Bacteria that have retained crystal violet during staining
- C.
Bacteria that maintain their peptidoglycan layer
- D.
Bacteria that failed to counterstain with safranin
- 14.Organism that can only thrive at very specific concentrations of oxygen within a medium (2-10% oxygen):
- A.
Obligate aerobes
- B.
Facultative anaerobes
- C.
Aerotolerant anaerobes
- D.
Microaerophiles
- 15.Gram positive bacteria stain:
- A.
Purple
- B.
Orange
- C.
Black
- D.
Pink
- 16.Bacterial type that presents teichoic acids associated to it's peptidoglycan cell wall:
- A.
Gram +
- B.
Gram -
- C.
Archaea
- D.
Acids Fast
- 17.Which dye will be more likely to adhere to the surface of a gram positive bacteria?
- A.
Anionic
- B.
Cationic
- C.
Neutral
- D.
Differential
- 18.Present outside the plasma membrane f organisms of domain Archaea:
- A.
Slime Layer
- B.
Endospores
- C.
Glycocalyx
- D.
S-layer
- 19.What component of the LPS structure acts as an exotoxin:
- A.
The O antigen
- B.
The Lipid A region
- C.
The core polysaccharide
- D.
The thecoid acid
- 20.Which of the following is true about the lag phase:
- A.
Cells adapt to a new medium
- B.
In some cases it may be very short
- C.
Cells replenish spent materials
- D.
All of the above
- 21.The largest most diverse group of photosynthetic bacteria:
- A.
Yeast
- B.
Lichens
- C.
Cyanobacteria
- D.
Archaea
- 22.The first stage of prokaryotic cell division entails:
- A.
Cytokinesis
- B.
Growth of a septum that separates the mother cell into two separate chambers
- C.
Growth of the cell dividing it's chromosome and enlarging it's cell volume
- D.
None of the above
- 23.Process of movement of bacteria towards or away from a particular stimulus or toxic agent:
- A.
Chemotaxis
- B.
Pseudopodia
- C.
Cilia
- D.
None of the above
- 24.Lacks a peptidoglycan cell wall and lives in extreme environments such as the hot springs of the Yellowstone Park:
- A.
Bacteria
- B.
Yeast
- C.
Prokaryotes
- D.
Archaea
- 25.Organism too small to be seen with the naked eye:
- A.
Microbiology
- B.
Microorganisms
- C.
Insects
- D.
Monkey's
- 26.
- A.
Facultative anaerobe
- B.
Strict anaerobe
- C.
Obligate aerobe
- D.
None of the above
- 27.Term that describes when light neither passes through or bounces off an object or is transmitted through them:
- A.
Transmission
- B.
Absorption
- C.
Diffraction
- D.
Refraction
- 28.Temperature below that of optimal growth cause bacterial cultures to:
- A.
Perish quickly at high temperatures
- B.
Slow their growth rate as temperatures approach the minimum
- C.
Thrive without any evident damage to the cell
- D.
None of the above
- 29.Bacterial families whose optimal growth occurs between pH 5.5 and pH 7:
- A.
Alkalophiles
- B.
Neutrophiles
- C.
Acidophiles
- 30.Observed during the death phase, it presents successive waves of genetically distinct variants:
- A.
The Log phase
- B.
The Lag phase
- C.
Prolonged decline growth
- D.
The stationary phase
- 31.Staining procedure designed for bacterial families with high lipid content and resistant to standard staining:
- A.
Gram stain
- B.
Negative staining
- C.
Simple stain
- D.
Acid fast staining
- 32.Which of the following is not considered a starvation response?
- A.
Cell death at a logarithmic rate
- B.
A decrease in cellular size and nucleoid condensation
- C.
Synthesis of starvation proteins
- D.
Endospore formation
- 33.Organelle responsible for the synthesis of protein in a eukaryotic cell:
- A.
The Golgi complex
- B.
The Smooth ER
- C.
The rough ER
- D.
The nucleus
- 34.Bacterial families whose optimal growth occurs between pH 0 and 5.5:
- A.
Alkalophiles
- B.
Neutrophiles
- C.
Acidophiles
- 35.What statement is NOT a reason for entering the stationary phase:
- A.
Nutrient limitation
- B.
Limited oxygen availability
- C.
Unlimited sources of nutrients
- D.
Reaching a critical population density
- 36.
- A.
Microscopes use long wavelengths to resolve images better
- B.
The smaller the wavelength used the better the resolution
- C.
Resolution is the ability to see two objects as separate discrete units
- D.
If resolution is poor magnification is useless
- 37.Internal structure of a prokaryotic cell that form small bodies with accumulation of cellular material:
- A.
Endospores
- B.
The Nuclear region
- C.
The Lysosomes
- D.
Inclusion bodies
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