Describe the nitrogen cycle that takes place in an aquarium
Nitrosomonas bacteria convert ammonia into nitrites, and then Nitrobacter bacteria convert the nitrites into
nitrates. Nitrates may inhibit the growth of fish, but they are not nearly as toxic as ammonia. Nitrites and
nitrates may be utilized by plants in the aquarium.
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The resistance to flow of a fluid through a tube can be computed according to which of the fol-lowing formulas?
a. Resistance = flow ? viscosity b. Resistance = flow ÷ pressure c. Resistance = pressure ÷ flow d. Resistance = flow ? pressure
In which section of the PDR can full-color pictures of drugs be found?
A) Product category index B) Manufacturer's index C) Product identification guide D) Brand and generic name index
Which of the following is the appropriate way to wrap instruments for sterilization?
A. Use plastic tape to close the pack B. Place all hinged instruments in the closed position C. Wrap each instrument in the fabric as loosely as possible D. Placing all instruments together with surfaces touching E. Use only double-thickness muslin to wrap instruments
How is asthma distinguished from an airway obstruction?
A. Asthma produces wheezing during expirations; airway obstruction produces stridor during inspirations. B. Asthma produces stridor during expirations; airway obstruction produces wheezing during inspirations. C. Asthma produces wheezing during inspirations; airway obstruction produces stridor during expirations. D. Asthma produces stridor during inspirations; airway obstruction produces wheezing during expirations.