Biological Classification question bank (Biology)

Bacteria have cell wall made of a polymer of N-acetylglucosamine and N-acetylmuramic acid connected by $\beta$-1,4 glycosidic bonds. Lysozyme, an enzyme, cleaves the glycosidic bond and disrupts the cell wall structure.

In an experiment, Gram-positive and Gram-negative bacteria, which differ in terms of cell envelope and peptidoglycan thickness, are treated with lysozyme and subsequently placed in a hypotonic solution. The correct statement about the effect of the treatment is:

Mitochondria are present in species $\mathbf{P}$, but absent in $\mathbf{Q}, \mathbf{R}$ and $\mathbf{S}$. The species $\mathbf{P}, \mathbf{Q}$, $\mathbf{R}$ and $\mathbf{S}$, respectively, are: