USMLE-Rx Step 1 Practice Q's

USMLE-Rx Step 1 Qmax Challenge #3952

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USMLE-Rx Step 1 Qmax Challenge #3952A man is brought to the emergency department following a bar fight and is treated for a deep laceration on his left cheek. On physical examination, there is no jaw deviation. He is able to blink, close his eyes tightly, wrinkle his forehead, and move his tongue symmetrically. Sensation throughout the face is intact. However, on closer inspection, the left corner of his mouth droops.

Using the image as a guide, through which of the following cranial structures does the damaged nerve pass?

A. Foramen magnum
B. Foramen ovale
C. Hypoglossal canal
D. Jugular foramen
E. Stylomastoid foramen

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USMLE-Rx Step 1 Qmax Challenge #3911

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USMLE-Rx Step 1 Qmax Challenge #3911A full-term baby is born to a 26-year-old woman who did not seek medical care during her pregnancy. The baby does well initially, but develops red eyes with purulent discharge on day 13. The responsible organism from a special cell culture is is shown in the image.

The infectious agent most likely responsible for this baby’s condition is also involved in the pathogenesis of which neonatal disease?

A. Cervicitis
B. Meningitis
C. Pelvic inflammatory disease
D. Pneumonia
E. Urethritis
F. Waterhouse-Friderichsen syndrome

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USMLE-Rx Step 1 Qmax Challenge #3905

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USMLE-Rx Step 1 Qmax Challenge #3905A previously healthy 41-year-old man misses several days of work as a result of a viral illness with symptoms including fever, headache, and fatigue. He also experiences a nonproductive cough and a sore throat. By the third day, his symptoms begin to subside and he is able to return to work. The next week, however, he experiences a rapid relapse. His cough returns, but now it is a productive cough with mucopurulent sputum. He also begins to experience pleuritic chest pain. On visiting a physician, x-ray of the chest is ordered and is shown in the image.

Which of the following describes the structure of the viral genome that most likely caused his initial illness?

A. Enveloped, double-stranded DNA
B. Enveloped, nonsegmented, single-stranded RNA
C. Enveloped, segmented, single-stranded RNA
D. Non-enveloped, nonsegmented, double-stranded RNA
E. Non-enveloped, nonsegmented, single-stranded RNA

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USMLE-Rx Step 1 Qmax Challenge #3902

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USMLE-Rx Step 1 Qmax Challenge #3902A 32-year-old janitor presents with a disease of infectious origin. The organism responsible for his symptoms is revealed with an India ink stain, shown in the image.

What clinical findings would be most likely in this patient?

A. Diffuse abdominal pain with rebound tenderness
B. Dull bone pain that worsens on movement
C. Fever, fatigue, cough, and pleuritic chest pain
D. Ulcerative cutaneous papules
E. Urinary frequency and urgency

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USMLE-Rx Step 1 Qmax Challenge #3390

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USMLE-Rx Step 1 Qmax Challenge #3390A 27-year-old woman presents to her primary care physician complaining of feeling “under the weather” for the past 2 weeks. Her history is remarkable only for previously diagnosed mitral valve prolapse. On examination, her temperature is 37.8°C (100°F). The patient has erythematous palms and painful, small lesions on her finger pads. The results of an ophthalmologic examination are shown in the image.

What is the most likely pathogen causing this woman’s symptoms?

A. Streptococcus agalactiae
B. Streptococcus sanguinis
C. Haemophilus influenzae
D. Staphylococcus aureus
E. Streptococcus pyogenes

———————–

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USMLE-Rx Step 1 Qmax Challenge #3884

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USMLE-Rx Step 1 Qmax Challenge #3884A baby boy was born at 37 weeks’ gestation at home without complication. Three days later, the umbilical stump started oozing blood. In addition, the baby’s last two bowel movements appeared black and were malodorous. The family history is negative for any known bleeding disorders.

Which of the coagulation profiles in the table is most likely for this infant?

A. A
B. B
C. C
D. D
E. E

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USMLE-Rx Step 1 Qmax Challenge #3493

6

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USMLE-Rx Step 1 Qmax Challenge #3493A 45-year-old man presents with a low-grade fever, hoarseness, cough, and a sore throat. On physical examination, he has swollen cervical lymph nodes. Gram stain of his sputum is obtained, and the specimen is shown in the image. Secretions obtained from the patient’s tonsils are analyzed using polymerase chain reaction, and a diagnostic protein subunit is found.

The exotoxin responsible for his symptoms inhibits protein synthesis by which of the following mechanisms?

A. Activation of adenyl cyclase by adenosine diphosphate ribosylation
B. Activation of Gs
C. Adenosine diphosphate ribosylation of elongation factor 2
D. Inhibition of Gi
E. Stimulating macrophages to release tumor necrosis factor-?

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Want to know the ‘bottom line?’ Purchase a USMLE-Rx Subscription and get many more features, more questions, and passages from First Aid, including images, references, and other facts relevant to this question.

This practice question is an actual question from the USMLE-Rx Step 1 test bank. For more USMLE Step 1 prep, subscribe to our Flash Facts and Step 1 Express video series. Score the best deal on all three products with a Step 1 Triple Play Bundle.

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