Review Question - QID 212793

A 21-year-old man presents to the emergency department with a 1-week history of increasing knee pain. Specifically, he says that the pain is severe enough that he is no longer able to bend his knee. His past medical history is not significant, but he says that he is sexually active with multiple partners. On physical exam, his right knee is found to be swollen, erythematous, and tender to palpation. Laboratory testing demonstrates an elevated erythrocyte sedimentation rate and C-reactive protein. Which of the following properties describes the organism that is most likely responsible for this patient's symptoms?