WBR0291
| Author | [[PageAuthor::Ogheneochuko Ajari, MB.BS, MS [1]]] |
|---|---|
| Exam Type | ExamType::USMLE Step 1 |
| Main Category | MainCategory::Microbiology, MainCategory::Pathophysiology |
| Sub Category | SubCategory::General Principles, SubCategory::Infectious Disease |
| Prompt | [[Prompt::A 28-year old female presents to the physicians office with complaints of fever, sore throat and swelling on the axilla. Physical examination revealed axillary lymphadenopathy with a temperature of 100F. A throat swab was taken and sent to the laboratory for culture. The organism cultured was a gram-positive rod that grew on tellurite agar, club shaped with metachromatic granules. The causative organism acts by which of the following mechanisms?]] |
| Answer A | AnswerA::It binds to MHC II and T-cell receptor, resulting in polyclonal T-cell activation |
| Answer A Explanation | AnswerAExp:: |
| Answer B | AnswerB::It acts via antibodies to M proteins to enhance the host defenses |
| Answer B Explanation | AnswerBExp:: |
| Answer C | AnswerC::It inhibits protein synthesis via ADP ribosylation of EF-2 |
| Answer C Explanation | AnswerCExp:: |
| Answer D | AnswerD::It blocks GABA and glycine release from cells in the spinal cord |
| Answer D Explanation | AnswerDExp:: |
| Answer E | AnswerE::It produces catalase to degrade hydrogen peroxide |
| Answer E Explanation | AnswerEExp:: |
| Right Answer | RightAnswer::C |
| Explanation | [[Explanation:: Educational Objective: |
| Approved | Approved::Yes |
| Keyword | |
| Linked Question | Linked:: |
| Order in Linked Questions | LinkedOrder:: |