Auxin has an effect on plant embryos much like the Bicoid protein in Drosophila. If auxin were added to a culture of embryonic root cells, what would be the likely result?
A) Root cells would elongate and mature.
B) Root cells would change into meristem cells.
C) Root cells would halt their development.
D) Root cells would not respond to auxin.
Answer: A
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Aquifex cannot use which of the following as electron donors?
A. Thiosulfate B. Sulfur C. Glucose D. Hydrogen
You have some old plastic Petri dishes that you would like to use for pouring bacteriological agar plates. The only method of physical sterilization is ultraviolet radiation sterilization with your UV light (you cannot use the autoclave because it will disfigure and melt the plastic). After sterilizing the plates, pouring the sterilized agar medium, and then leaving the plates out at room temperature for a day or two to let them solidify and dry, you find contaminating bacterial colonies growing on the agar. Predict what has happened in this situation.
A. The room temperature enhanced the growth of normal biota of the agar. B. The agar had bacteria in it, even after sterilization in the autoclave. C. Air got into the poured agar plates, contaminating them. D. The lids of the Petri dishes were inadvertently left on while being sterilized.
The most probable number (MPN) technique is an approach that can be used to quantify the presence of a particular microbe whether or not that microbe is culturable.
Answer the following statement true (T) or false (F)
Which of the following can be inferred from the presence of coliforms in water?
a. fecal contamination b. poor water quality c. presence of toxins d. both fecal contamination and poor water quality