USMLE Step 1 Multisystem Processes Practice Questions
8–12% of Step 1 · 34 practice questions with a note on every option
280 questions in 14 timed 30-minute blocks, with your score in multisystem processes and every other content area.
Free multisystem processes drillA 38-year-old farmworker is brought to the emergency department 1 hour after he became confused while spraying crops. He has profuse salivation, tearing, vomiting, diarrhea, urinary incontinence, and wheezing with copious bronchial secretions. His pulse is 46/min. Examination shows pinpoint pupils, diffuse muscle fasciculations, and weakness. He is treated with intravenous atropine and a second drug that is most effective when given early. Which of the following is the mechanism of action of the second drug?
Multisystem Processes & Disorders on Step 1
Multisystem Processes & Disorders is 8–12% of Step 1. It holds the general principles that run through every organ: microbiology, genetics, metabolism, cell injury and inflammation, neoplasia, and pharmacokinetics.
- Share of Step 1
- 8–12% of the exam, per the USMLE content outline
- On our mock exam
- 28 of 280 questions, with your score for this system in the result
- Our drill
- 10 questions from 34 multisystem processes questions, untimed, a note on every option; one free attempt, unlimited with a pass
What Step 1 multisystem processes questions test
- Microbiology: bacterial structure and toxins, viruses, fungi, parasites, antimicrobial mechanisms and resistance
- Sepsis and the systemic response to infection
- Genetics: inheritance patterns, trinucleotide repeats, chromosomal disorders and population genetics
- Biochemistry and nutrition: inborn errors of metabolism, vitamins and deficiency states
- Cell injury, necrosis and apoptosis, inflammation and repair, and principles of neoplasia
- Pharmacokinetics, pharmacodynamics, drug interactions and toxicology
Sit all 280 questions in timed blocks
280 questions in 14 timed 30-minute blocks, with your score in multisystem processes and every other content area.
Free multisystem processes drillHow to study it
- Learn antibiotics by target (cell wall, ribosome, DNA) and the classic resistance mechanism for each.
- For metabolism, learn which enzyme is missing, what builds up, and the one clinical clue.
- Practice Hardy-Weinberg and inheritance-risk calculations until they are routine.
Common questions
Where is microbiology tested on Step 1?
Microbiology (10–20% of Step 1) appears in every system, but the general principles of bacteria, viruses, fungi and antimicrobials sit in this category in our bank.
Is biochemistry still tested on Step 1?
Yes. Biochemistry is listed at 5–15% of Step 1. Questions present a patient with an inborn error or a deficiency and ask for the missing enzyme or the substrate that builds up.
280 questions in 14 timed 30-minute blocks, with your score in multisystem processes and every other content area.
Free multisystem processes drillThe other Step 1 systems
Sources
- USMLE: Step 1 (blocks, items, testing day, break time)
- USMLE: Step 2 CK (blocks, items, testing day, break time)
- USMLE: Test delivery software updates for Step 2 CK and Step 1 (May 2026)
- USMLE: Step 1 content outline and specifications
- USMLE: Step 2 CK content outline and specifications
- USMLE: Examination results and scoring (minimum passing scores)
- USMLE Bulletin: Scoring and score reporting (about 60% correct to pass; result timing)
- USMLE Bulletin: Eligibility (attempt limits)
- USMLE: Apply for exams (2026 and 2027 fees, FSMB registration, region fees)
- USMLE: Performance data (pass rates)
- Intealth ECFMG: Fees overview (ECFMG Certification)
Original practice questions written to the USMLE content outlines and current standard references. USMLE® is a joint program of the Federation of State Medical Boards (FSMB) and NBME. Independent practice, not affiliated with or endorsed by the FSMB, NBME or Intealth (ECFMG). Follow current guidelines in clinical practice.