What is characteristic of aerotolerant anaerobes?

Aerotolerant anaerobes are microorganisms that do not use oxygen for growth but can still survive and grow in its presence. This unique characteristic allows them to thrive in environments where oxygen is available without being inhibited or killed by it. Unlike strict anaerobes, which are harmed by oxygen, aerotolerant anaerobes possess mechanisms that allow them to tolerate oxygen, often through the production of enzymes that neutralize harmful reactive oxygen species.

This adaptability makes aerotolerant anaerobes quite versatile, as they can grow in various environments, including those that may fluctuate in oxygen availability. Hence, the correct answer highlights their ability to grow in the presence of oxygen while not actually utilizing it for energy production.