8. Which of the following can be used as electron acceptors during anaerobic respiration? A. Nitrate B. Sulfate C. Carbon dioxide D. All of the choices are correct.

D. All of the choices are correct.

Explanation:

Anaerobic respiration is a type of respiration where molecular oxygen () does not act as the terminal electron acceptor. In this case, other electron acceptors, such as nitrate, sulfate, carbon dioxide are used.

For example, Denitrifying bacteria use nitrate as their terminal electron acceptor; e.g. Clostridium

Sulfate is used as the terminal electron acceptor by sulfate-reducing organisms such as Archaeoglobus

Carbon dioxide is used by methanogens such as Methanococcus. Methanogens are organism that produce methane by a process called methanogenesis.