Cytochromes are electron transport intermediates containing heme-related:

Explanation

Cytochromes are electron transport intermediates that contain heme as a prosthetic group. The heme prosthetic group is crucial, as it allows cytochromes to facilitate the transfer of electrons within the electron transport chain, a vital step in cellular respiration. The heme group is permanently attached and essential for the cytochrome's function, distinguishing it from coenzymes, which are not permanently attached. Activators and ribozymes are unrelated to the role of cytochromes, as activators increase enzyme activity generally without being part of the enzyme structure, and ribozymes are RNA molecules, not proteins.