Question

Which of the following is true for the nitrifying bacteria belonging to genus Nitrobacter?

• A. They are autotrophs.
• B. They are eukaryotes.
• C. They convert chemical energy to cellular energy using mitochondria.
• D. They convert \( \text{NO}_3 \) to \( \text{NO}_2 \).

Hint:

Nitrifying bacteria are autotrophs that play a crucial role in the nitrogen cycle by converting ammonia and nitrites into nitrates.

Answer 1

The Correct Option is A

Nitrifying bacteria, such as those in the genus Nitrobacter, are autotrophic organisms. They obtain their energy from inorganic compounds, specifically by converting ammonia or nitrite into nitrate. This process is essential in the nitrogen cycle. They are not eukaryotes, and their energy conversion does not involve mitochondria as in eukaryotic cells. Therefore, the correct answer is (A).
Final Answer: \[ \boxed{(A) \, \text{They are autotrophs.}} \]