Regarding bacteria that utilize respiration as a way to catabolize a complex carbon (food) source. Which of A-D is true? a. They require the use of an electron transport chain b. They are generally considered heterotrophs c. They do not necessarily have to use oxygen as a terminal electron acceptor d. They do not fix carbon dioxide e. A-D are all true

• A-D are all true

Explanation:

In bacteria, the electron transport chain is located in their cell membrane and is used when the bacteria needs to produce energy using complex carbon compounds. Most bacteria are heterotroph especially those that have the ability to form ATP using carbohydrates. Contrary to humans respiration which depends on oxygen as the final electron acceptor in the last stage of ETC, bacteria can use sulfate, nitrate, CO2. Iron (III) or even organic compounds like DMSO as electron acceptor. Only autotrophic bacteria can fix carbon and not heterotrophs.