Microbiology MCAT Practice Questions
12 board-style MCAT questions in Biological & Biochemical Foundations (B/B). Each question shows the correct answer; create a free account for the full explanation and adaptive practice.
- MCAT · medium1. During a viral infection, a patient's dendritic cells present viral antigens via MHC class I molecules to CD8+ T cells. The dendritic cells have undergone cross-presentation, a…
- MCAT · medium2. A researcher isolates a Gram-positive bacterium from a wound infection and performs antibiotic susceptibility testing. The organism shows resistance to beta-lactam antibiotics b…
- MCAT · medium3. A 34-year-old woman presents with a 5-day history of fever, myalgias, and cough consistent with acute viral respiratory infection. A nasopharyngeal swab is positive for influenz…
- MCAT · medium4. A 24-year-old man presents to the emergency department with fever, severe headache, and nuchal rigidity. Physical examination reveals a petechial rash on his trunk and lower ext…
- MCAT · medium5. A 34-year-old male with HIV (CD4 count 87 cells/µL) presents with a 6-week history of fever, night sweats, and productive cough. Chest X-ray shows infiltrates in the right upper…
- MCAT · medium6. A 68-year-old man with type 2 diabetes presents with severe watery diarrhea, fever (38.9°C), and abdominal cramping after 2 weeks of ciprofloxacin use for a urinary tract infect…
- MCAT · medium7. A 28-year-old man from Cameroon presents to the clinic with his third episode of malaria over the past 18 months, despite previously receiving treatment with artemisinin combina…
- MCAT · medium8. A 34-year-old male presents to the clinic with recurrent skin infections caused by Staphylococcus aureus. His medical history is notable for multiple episodes of severe cellulit…
- MCAT · medium9. A 32-year-old man with HIV/AIDS (CD4+ count 45 cells/μL) presents with persistent oral candidiasis despite fluconazole prophylaxis. Oral swabs are cultured and Candida albicans…
- MCAT · medium10. During a bacterial infection, Vibrio cholerae secretes cholera toxin, an AB5 toxin that enters epithelial cells and catalyzes ADP-ribosylation of the Gs alpha subunit of heterot…
- MCAT · medium11. A 42-year-old man with a 3-week history of productive cough, night sweats, and weight loss is diagnosed with pulmonary tuberculosis. Acid-fast bacilli are confirmed on sputum sm…
- MCAT · medium12. A 68-year-old man with COPD presents to the ED with fever (38.9°C), productive cough, and shortness of breath. Chest X-ray shows left lower lobe consolidation. Sputum culture gr…