Question: A characteristic that distinguishes mutant bacterial cells from non-mutant cells is called _______.
Answer Choices:
mutation rate
chromosome
genetic marker
natural selection
Answer: genetic marker
Question: True or False: Most animal vectors are arthropods.
Answer Choices:
True
False
Answer: True
Question: What is a substance produced largely by certain bacteria or fungi that can inhibit or stop the growth of other microorganisms?
Answer: antibiotic
Question: Which father of microbiology created the smallpox vaccine?
Louis Pasteur
Answer Choices:
Edward Jenner
Joseph Lister
Robert Koch
Answer: Edward Jenner
Question: The standard ‘9+2’ flagellum structure is common in __________ organisms.
Eukaryotic
Answer Choices:
Prokaryotic
Both
Neither
Answer: Eukaryotic
Question: MacConkey agar is a differential and selective medium.
Answer Choices:
True
False
Answer: True
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?
1.56 x 10^3 CFU/mL
Answer Choices:
1.56 x 10^7 CFU/mL
1.56 x 10^8 CFU/mL
1.56 x 10^9 CFU/mL
Answer: 1.56 x 10^9 CFU/mL
Question: One mL of a sample had been diluted to 10^-8 and was spread on a TSA plate. The plate yielded 80 CFU. What is the original cell density (OCD)?
Answer Choices:
80 x 10^8 CFU/mL
8 x 10^8 CFU/mL
Answer: 80 x 10^8 CFU/mL
Question: What are the mutants/mL of a TSA + streptomycin agar plate that contains 1.5 mL of sample and 25 mutant colonies (rounded to nearest whole)?
Answer Choices:
38 mutants/mL
17 mutants/mL
Answer: 17 mutants/mL
Question: Detection of _____________ by the bobtail squid triggers mucus production in the light organ.
Flagellin
Answer Choices:
Bioluminescence
Peptidoglycan
Capsules
Answer: Peptidoglycan