Histology for the USMLE: Exam Questions and Preparation
How Histology is tested on the USMLE, the high-yield topics, a preparation approach and original practice questions with explained answers.
Histology and cell biology on the USMLE test whether you can recognize a tissue or cellular finding and link it to function or disease. You rarely need to name a slide, but you do need to know what normal tissue looks like in order to recognize what has changed.
Step 1 is reported as pass/fail, and its questions are integrated across disciplines and organ systems, so the subject labels below are study aids, not separate exams. The practice questions here are original and written to show the style of reasoning the exam rewards; they are not real exam items. Confirm the current content outline on the official USMLE website.
How Histology is tested
Questions may show a micrograph, or describe a biopsy finding in words, and ask for the diagnosis, the process or the cellular defect. Cell biology questions ask about organelles, the cytoskeleton, cell junctions and protein trafficking.
High-yield topics
- Epithelial types and where they are found
- Collagen types and the diseases of their defects
- Cell cycle, cytoskeleton, cell junctions and organelle function
- Blood cells, bone marrow and lymphoid tissue
- Endocrine tissue: thyroid, adrenal zones, pancreas and pituitary
- GI, respiratory and kidney histology, including metaplasia and dysplasia
- Pairing a histologic finding with its disease, such as Reed-Sternberg cells or Auer rods
Preparation approach
- Use an atlas or labeled slides alongside your notes, and test yourself on unlabeled images.
- Learn collagen types and their diseases as a short table and review it often.
- For every organ, know the normal layers, then ask what the common metaplasias and tumors look like.
- Practice describing an image in words, because the exam often gives you the description instead of the picture.
Practice questions
Question 1
A child has blue sclerae, multiple fractures after minor trauma and hearing loss. Defective synthesis of which type of collagen is responsible?
- A. Type I
- B. Type II
- C. Type III
- D. Type IV
- E. Type X
Answer: A. This is osteogenesis imperfecta, usually caused by mutations in type I collagen genes. Type I collagen is the main collagen of bone, skin, tendon and sclera.
Question 2
An esophageal biopsy from a man with long-standing reflux shows columnar epithelium with goblet cells in place of stratified squamous epithelium. Which process does this represent?
- A. Hyperplasia
- B. Atrophy
- C. Metaplasia
- D. Anaplasia
- E. Hypertrophy
Answer: C. Replacement of one mature cell type by another is metaplasia. In Barrett esophagus it increases the risk of esophageal adenocarcinoma.
Question 3
A child with coarse facial features, restricted joint movement and psychomotor delay has inclusion bodies in fibroblasts. Which defect causes this disease?
- A. Failure of ribosomes to attach to the endoplasmic reticulum
- B. Defective phosphorylation of mannose residues in the Golgi apparatus
- C. Absent peroxisomal enzymes
- D. Defective microtubule dynein arms
- E. Failure of proteasome degradation
Answer: B. This is I-cell disease. Without the Golgi phosphotransferase, lysosomal enzymes are not tagged with mannose-6-phosphate and are secreted instead of delivered to lysosomes.
Make it a plan
Put these subjects inside a dedicated study block with timed question blocks and careful review. See our Step 1 preparation timeline for a schedule and weekly milestones. This article is general educational guidance and not an individualized study plan.
Educational content only. Confirm current exam requirements with USMLE.