When reduced sulfur compounds associated with coal deposits are exposed to atmospheric oxygen, which kinds of organisms are responsible for conversion of these to sulfate?
A) oligochaete worms
B) bacteria
C) various plants used in reclamation of mining wastes
D) saprophytic fungi
E) all of the above
Ans: B) bacteria
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A sudden or total lack of oxygen can cause unconsciousness in 5–10 seconds. Why?
a. The brain has very high energy requirements and lack of oxygen reduces available energy. b. Oxygen is required for ventilation and lack of ventilation causes fainting. c. Lack of oxygen causes an increase in carbon dioxide, which is toxic. d. The brain needs oxygen to breathe, and when oxygen is not available, it signals the nervous system to cause fainting.
____________________ covers and protects the outer surfaces of primary plant parts. Fill in the blank(s) with the appropriate word(s)
Which of the following cycles have particles deposit from the atmosphere in both a dryfall and a wetfall?
A) nitrogen B) oxygen C) carbon dioxide D) sulfur
For each item listed below, select a sterilant that you feel is the most suitable and effective for that item. Discuss why you selected each sterilant.A) plastic Petri dishes to be used for nutrient mediaB) glass tubes of bacterial cultures to be discardedC) sterile milkD) dozens of reusable glass pipetsE) bone tissue for graftingF) room airG) hospital mattressesH) biopsy tissue for histology analysisI) plastic respiratory therapy equipment and arthroscopesJ) vaccines
What will be an ideal response?