Answer Options:
Oxidase
β-galactosidase
Amylase
Glucuronidase
Answer Options:
Oxidase
β-galactosidase
Amylase
Glucuronidase
Answer: β-galactosidase
Question: The phases of a typical bacterial growth curve, in order, are:
Answer Options:
I, II, III, IV
lag, stationary, exponential, death
lag, exponential, stationary, death
Answer: lag, exponential, stationary, death
Question: Endo agar is both selective and differential. The agar selects for ______ bacteria and differentiates those that grow by their ability to ______.
Answer Options:
Gram-positive, ferment lactose
Acid fast, produce endospores
Anaerobic, reduce nitrate
Gram-negative, ferment lactose
Answer Options:
Gram-positive, ferment lactose
Acid fast, produce endospores
Anaerobic, reduce nitrate
Gram-negative, ferment lactose
Answer: Gram-negative, ferment lactose
Question: In a Colilert technique, the presence of this bacterial enzyme is visualized as blue fluorescence under UV light and indicative of E. coli contamination.
Answer Options:
Catalase
Galactosidase
Glucuronidase
Oxidase
Answer: Galactosidase
Question: You inoculated an agar deep with an unknown culture and observed growth ONLY in the bottom of the tube after incubation. How would you describe the aerotolerance of this microorganism?
Answer Options:
Facultative anaerobe
Obligate anaerobe
Obligate aerobe
Answer: Obligate anaerobe
Question: Osteomyelitis is ________.
Answer Options:
caused by altered vitamin D metabolism
due to pus-forming bacteria
literally known as “soft bones”
partially due to insufficient dietary calcium
Answer: due to pus-forming bacteria
Question: Which of the following is true about viruses in soil?
Answer Options:
They are present in low abundance.
They can be easily recovered from soil organic matter.
They can contribute to carbon cycling and organic matter degradation through auxiliary metabolic genes.
They allow the cells to withstand harsh environmental conditions.
Answer: They can contribute to carbon cycling and organic matter degradation through auxiliary metabolic genes.
Question: What organism are viruses not capable of infecting?
Answer: Other viruses
Question: True or False: Viruses are part of the healthy human microbiome.
Answer Options:
True
False
Answer: True
Question: True or False: Interferons are effective against viral pathogens.
Answer Options:
True
False
Answer: True
Question: Which of the following organisms has a chained cellular arrangement?
Answer Options:
Bacillus subtilis
Streptococcus pyogenes
Escherichia coli
Staphylococcus aureus
Answer: Streptococcus pyogenes
Question: All microbes associated with food are harmful and should be eliminated.
Answer Options:
True
False
Answer: False
Question: In bacterial cells, the electron transport system is located in the:
Answer Options:
Cytoplasm
Cell membrane
Mitochondria
Chloroplast
Ribosome
Answer: Cell membrane
Question: All bacterial cells have:
Endospores
Flagella
Plasmids
A chromosome
Mitochondria
Answer: A chromosome
Question: True or False: The human skin is considered a more hostile environment for microbes than the human mouth.
Answer Options:
True
False
Answer: False
Question: You are a new member of the Micro Lab prep staff. In order to get the best media making assignments for the semester, Professor Waters sets up a simple test: You must calculate the number of cells that grow in a bacterial culture over the course of an 8 hour incubation period. Here’s what you know:
The culture was started with 68 cells.
The generation time of this organism is 30 minutes.
The incubation period is 8 hours.
What is the total number of cells in the culture at the end of the 8 hour incubation period?
Answer Options:
32,640 cells
4,462,944 cells
6,323,786,496 cells
16,320 cells
Answer: 6,323,786,496 cells
Question: Use the diagram below to answer this question: The entire diagram depicts the cell envelope from a typical ________ cell.
Answer Options:
Gram-positive bacteria
Archaea
Gram-negative bacteria
Eukaryotic
None of these are correct
Answer: Gram-negative bacteria
Question: True or False: Microbes do not cause and/or are not associated with cancers or tumor cells.
Answer Options:
True
False
Answer: False
Question: Which antimicrobial target would result in high (good) selective toxicity for that drug?
Answer Options:
Cell membrane function
Peptidoglycan synthesis
Nucleic acid synthesis
None of these
Answer: Peptidoglycan synthesis
Question: ________ medium designed to permit the growth of a particular organism while inhibiting the growth of others.
Answer Options:
Defined
Undefined
Selective
Differential
Answer: Selective
Question: True or False: The upper respiratory tract has a more diverse normal microbiome than the lower respiratory tract.
Answer Options:
True
False
Answer: True
Question: The three domains of life are the Bacteria, Eukarya, and the:
Answer Options:
Monera
Protista
Fungi
Viruses
Archaea
Answer: Archaea
Question: Osteomyelitis is ________.
Answer Options:
caused by altered vitamin D metabolism
due to pus-forming bacteria
literally known as “soft bones”
Answer: – due to pus-forming bacteria
Question: Normal skin flora helps prevent harmful organisms from colonizing the skin.
Answer Options:
True
False
Answer: True
Question: True or false: Most animal vectors are mammals.
Answer Options:
True
False
Answer: True