Scientists group organisms into kingdoms by looking at specific characteristics. Thermus aquaticus, shown below, is a specialized bacteria called a thermophile. Thermophiles are microorganisms that can live in bodies of water that are extremely hot, such as deep sea hydrothermal vents. A microscopic image of thermus aquaticus. Which characteristic most likely describes a mushroom but not Thermus aquaticus? cell wall eukaryotic unicellular prokaryotic