Final answer:
Complex IV, also known as cytochrome c oxidase, contains three proteins designated as the I, T, and C types. It plays a crucial role in the reduction of oxygen and the formation of water in aerobic respiration.
Step-by-step explanation:
The Complex IV contains three proteins designated as the I, T, and C types. Complex IV, also known as cytochrome c oxidase, is composed of cytochrome proteins c, a, and a3. It contains two heme groups and three copper ions, and it plays a crucial role in the reduction of oxygen and the formation of water in aerobic respiration.