Figure 26.1 -Bacteria Able to Perform the NH₄⁺ + NO₂^- -N₂

question 15

Multiple Choice

Figure 26.1
-Bacteria able to perform the NH₄⁺ + NO₂^- -N₂ + 2H₂O reaction have been discovered in laboratory bioreactors and wastewater treatment systems. Researchers predicted that these bacteria should exist in oceans. They measured the concentration of NH₄⁺, NO₂^- , NO₃^- , and O₂ in the Black Sea as a function of water depth M. Kuypers et al. 2003 Anaerobic ammonium oxidation by anammox bacteria in the Black Sea. Nature
422:608- 11) to determine where in the sea the bacteria might live. Analyzing data presented in Figure 26.1 above, at what depth would you expect to find the bacteria? Note: In the figure, different scales are used to show concentrations of NH₄⁺, NO₂^- , NO₃^- , and O₂.)

• A) in the top 5 metres
• B) below 100 metres
• C) in the top 50 metres
• D) at a depth of 92 metres
• E) at a depth of 75 metres

---

Definitions:

Salaries Expense

The total amount recorded by a company for the salaries of its employees.

Salaries Payable

An account reflecting the debts to workers for performed but unpaid work.

Closing Entry

Journal entries made at the end of an accounting period to transfer the balances of temporary accounts to permanent accounts, ultimately resetting the balances of temporary accounts to zero.

Income Summary

An account used in the closing process that summarizes the results of operations by collecting all revenue and expense account balances before determining the net income or loss.