In this task you will be given a passage and a yes/no question based on the passage. You should answer the question using the information from the passage.

passage: Historically, the gram-positive forms made up the phylum Firmicutes, a name now used for the largest group. It includes many well-known genera such as Bacillus, Listeria, Staphylococcus, Streptococcus, Enterococcus, and Clostridium. It has also been expanded to include the Mollicutes, bacteria like Mycoplasma that lack cell walls and so cannot be stained by Gram, but are derived from such forms.
question: could bacteria that do not contain cell walls be stained using gram stain?
No