The background of a Brown and Hopps gram stained section is intense red. This could most likely be corrected in the future by changing the time in the:
a) iodine solution
b) Gallego solution
c) picric acid-acetone
d) crystal violet
Answer: c) picric acid-acetone
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Which group of microorganisms is most likely to spoil a freshwater trout preserved with salt?
A) psychrophiles
B) facultative halophiles
C) anaerobes
D) thermophiles
E) hyperthermophiles
Which of the following cell types is responsible for the humoral immune response?
A) B cells B) neutrophils C) natural killer cells D) macrophages
Denitrifying Bacteria and Archaea are chemoorganotrophs that grow by anaerobic respiration using ________ and producing ________
a. nitrate (NO3–) or nitrite (NO2–) / dinitrogen gas (N2) or nitrous oxide (NO) b. dinitrogen gas (N2) or nitrous oxide (NO) / nitrate (NO3–) or nitrite (NO2–) c. dinitrogen gas (N2) or nitrous oxide (NO) / ammonia (NH3) or CO2 d. nitrate (NO3–) or nitrite (NO2–) / ammonia (NH3) or water
How can one distinguish between annuals, biennials, and perennials?
A. how tall they grow B. the time from seed germination to seed production C. the amount of root development D. the environment they grow in E. the number of flowers they produce