Texas Wastewater Class B Practice Exam

Aerobic bacteria require what element in the water for their metabolism?

1. Carbon dioxide

2. Hydrogen

3. Oxygen

4. Nitrogen

The correct answer is: Oxygen

The correct answer is Oxygen because aerobic bacteria are microorganisms that thrive in environments where oxygen is present. They use oxygen in their metabolic processes to break down organic matter and convert it into energy, carbon dioxide, and water. This process is essential for the decomposition of waste and the treatment of wastewater, as it helps maintain a healthy ecosystem in treatment facilities. Carbon dioxide, hydrogen, and nitrogen are important elements in various biological processes, but they do not serve as the primary requirement for aerobic bacteria's metabolism. Carbon dioxide is a byproduct of respiration, hydrogen is a component of different organic compounds, and nitrogen is crucial for the synthesis of amino acids and proteins. However, none of these elements can fulfill the oxygen requirement that is fundamental for the growth and energy production of aerobic bacteria.