Question 1
A 45-year-old man presents with fatigue and jaundice. Laboratory studies show elevated unconjugated bilirubin. Which enzyme deficiency is most likely responsible for this presentation?
Correct Answer:
UDP-glucuronosyltransferase
Question 2
A 2-year-old child presents with developmental delay, intellectual disability, and a musty odor to the urine. Which dietary restriction is essential for this patient?
Correct Answer:
Phenylalanine
Question 3
A researcher is studying a signaling pathway where a ligand binds to a receptor tyrosine kinase, leading to cell proliferation. Which of the following is the most likely downstream signaling molecule in this pathway?
Correct Answer:
Ras protein
Question 4
A 6-month-old infant presents with fasting hypoglycemia, hepatomegaly, and lactic acidosis. A liver biopsy shows glycogen accumulation. Which enzyme deficiency is most likely?
Correct Answer:
Glucose-6-phosphatase
Question 5
A patient with a history of alcohol abuse presents with neurological symptoms including ophthalmoplegia, ataxia, and confusion. Which vitamin deficiency is most likely responsible?
Correct Answer:
Thiamine (Vitamin B1)
Question 1
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Prepare with the USMLE Step 1 Practice Questions - United States Medical Licensing Examination Step 1 Exam practice quiz. This question bank includes 100 questions covering patient, presents, responsible, shows, and develops. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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USMLE Step 1 Practice Questions - United States Medical Licensing Examination Step 1 Exam

This practice set contains 100 questions from the matching question bank and focuses on patient, presents, responsible, shows, and develops. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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