Which of the following is a common feature of pathogenic bacteria?

Pathogenic bacteria often produce toxins as a key feature that contributes to their ability to cause disease. Toxins can disrupt normal cellular functions, evade the host's immune response, and lead to tissue damage or sickness in the host organism. This production of toxins is a significant determinant of pathogenicity, allowing these bacteria to establish infections and spread in various environments.

In contrast, while some bacteria can indeed form endospores as a survival mechanism, this trait is not exclusive to pathogenic bacteria and does not directly relate to their ability to cause disease. The ability to photosynthesize is primarily associated with certain non-pathogenic organisms, particularly plants and some cyanobacteria, and does not play a role in pathogenicity. Additionally, although some bacteria have developed mechanisms to metabolize antibiotics, this does not necessarily indicate that they are pathogenic; it reflects an adaptation to survive in the presence of antibiotic pressure but does not equate to causing disease or infection.