Question: Amylase is a constitutive enzyme for Bacillus.
Answer Choices:
True
False
Answer: True
Question: True or False: Red blood cells are smaller than bacterial cells.
Answer Choices:
True
False
Answer: False
Question: Endo agar is both selective and differential. The agar selects for ______ bacteria and differentiates those that grow by their ability to ______.
Answer Choices:
Gram-positive, ferment lactose
Acid fast, produce endospores
Anaerobic, reduce nitrate
Gram-negative, ferment lactose
Answer: Gram-negative, ferment lactose
Question: The most abundant macromolecule (by weight) in a cell is:
Answer Choices:
water
carbon
oxygen
protein
Answer: water
Question: Bacterial and fungal colonies are easily distinguished by their appearance on Trypticase Soy Agar plates.
Answer Choices:
True
False
Answer: True
Question: What type of agar is used to perform the Kirby-Bauer test?
TSA
Answer Choices:
Glucose Mineral Salts Agar
Mueller-Hinton Agar
MFC Agar
Answer: Mueller-Hinton Agar
Question: What is the dilution factor, if you are conducting a serial dilution and you add 1 ml of culture to 99 mL PBS?
10^-1
10^-2
Answer Choices:
1:10
0.1
10^-3
Answer: 10^-2
Question: Members of the genus Sphingomonas can withstand temperatures as low as -20°C. These organisms are examples of:
Answer Choices:
extremophiles
psychrophiles
halophiles
Both a & b
Both a & c
Answer: Both a & b
Question: Which type of microscope can be used to observe viruses?
Answer Choices:
Phase Contrast?
Dark Field
Bright Field
Scanning Electron Microscope (SEM)
Answer: Scanning Electron Microscope (SEM)
Question: All strains of E. coli are pathogenic.
Answer Choices:
True
False
Answer: False
Question: A broth has 2.20 x 10^3 CFU/mL. Approximately how many CFUs would you expect to count if you plated 0.5 mL? Please provide WHOLE number, NO EXPONENTS.
Answer Choices:
22 CFU
2 CFU
110 CFU
220 CFU
Answer: 110 CFU
Question: Following are data collected from a serial dilution experiment using E. coli in which you plated 100 microliters (0.1 mL) onto each of the following plates. What is the concentration of cells in the original stock solution?
Tube Dilution: 10^-4, 10^-5, 10^-6, 10^-7
Plate Colonies: TMTC, 968, 156, 14
Answer Choices:
1.56 x 10^8 CFU/mL
1.56 x 10^9 CFU/mL
1.56 x 10^7 CFU/mL
Answer: 1.56 x 10^8 CFU/mL
Question: You are uncertain about the Gram status of an organism and have been instructed to determine it without conducting a Gram stain. Which of the following reagents would you need?
Answer Choices:
Crystal violet
Hydrogen peroxide
Potassium hydroxide
Answer: Potassium hydroxide
Question: Mannitol salt agar (MSA) is an example of a medium that is:
Answer Choices:
Selective
Differential
Both
Answer: Both
Question: Protozoa can exist in both cyst and trophozoite forms.
Answer Choices:
True
False
Answer: True