Which method of evaluating disinfectants is the currently used standard?
A. use-dilution test
B. use-diffusion test
C. disk-dilution test
D. disk-diffusion test
Ans: A. use-dilution test
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Which of the following elements correctly pairs an essential element in plants with its function?
A) nitrogen â€" component of nucleic acids, proteins, hormones, coenzymes B) magnesium â€" component of nucleic acids, phospholipids, ATP, several coenzymes C) phosphorus â€" cofactor functioning in protein synthesis D) potassium â€" component of chlorophyll; activates many enzymes E) sulfur â€" component of DNA; activates some enzymes
Members of the order Desulfovibrionales use which of the following as electron acceptors during anaerobic respiration?
A. Organic acids and alcohols B. CO2 C. O2 D. Elemental sulfur or sulfate
Match the following items with the correct phrases.
_______1. Organisms that prefer salty environments are called ____________________. _______2. Organisms that have especially demanding nutritional requirements are called ____________________. _______3. Organisms that prefer environments having decreased concentrations of oxygen are called ____________________. _______4. Organisms that prefer refrigerator temperature are called ____________________. _______5. Organisms that grow best in environments containing increased concentrations of carbon dioxide are called _______________. a. capnophiles b. fastidious organisms c. halophiles d. microaerophiles e. psychrotrophs
Imagine you are working in the laboratory. You have just raised 15g of water 1 degree Celsius. How many Calories of energy did you utilize to heat the water in this procedure?
A. 0.07 B. 70 C. 0.0015 D. 0.015 E. 1.5 F. 15