Eubacteria are those bacteria that are considered to be real bacteria and they can be found virtually everywhere. They are prokaryotes and thus lack true nucleus. They are normally categorized based on their shapes. One specific characteristic of eubacteria is their possession of cell walls that are made of peptidoglycan, this chemical strengthen their cell wall and enhance their ability to withstand hostile environments.
The correct answer is the last option. The characteristic proves Lactobacillus acidophilus is from the specific kingdom Eubacteria is that it has peptidoglycan. The peptidoglycan can be in the cell wall of the <span>Lactobacillus acidophilus which is unique for Eubacteria kingdom.</span>
