Multiple choice Which of the following is an example of iron-oxidising chemolithotrophic bacteria? Gallionella ferruginea Alcaligenes eutrophus Rhodospirillum rubrum Nitrosomonas europaea None of the above Reveal answer Fill a bubble to check yourself A Correct answer Explanation Gallionella ferruginea is an iron-oxidising chemolithotrophic bacterium. It oxidises Fe++ as a source of energy for lithoautotrophic growth.