# USABO - USA Biology Olympiad — Practice Test Geeks
# https://practicetestgeeks.com/llms/usabo-usa-biology-olympiad.txt
# Updated: 2026-07-10

> Free USABO - USA Biology Olympiad practice tests and study guides. Pass the USABO exam with confidence. Practice questions with detailed explanations and instant feedback on every answer. Language: English. Region: US.

## Overview

- **Category**: USABO - USA Biology Olympiad
- **Main page**: https://practicetestgeeks.com/usabo-practice-test
- **Language**: English | **Region**: US
- **Practice tests**: 15 tests, 103 questions total
- **Exam simulation**: Full-length 50-question timed exam (50 min, 50% pass mark)
- **Study guides / articles**: 12 published

## Exam Simulations (Full-Length, Timed, Scored)

Simulates real exam conditions: question count, time limit, passing score, domain weighting.

- [USABO Open Exam](https://practicetestgeeks.com/usabo/exam) — 50 questions, 50 min, 50% pass
  The USA Biology Olympiad (USABO) Open Exam is the first round of the national biology competition, testing high school students across all major biolo

## Practice Tests (15 available)

- [Free USABO Anatomy and Physiology Questions and Answers](https://practicetestgeeks.com/free-usabo-anatomy-and-physiology-questions-and-answers) (11 questions)
- [Free USABO Genetics and Cell Biology Questions and Answers](https://practicetestgeeks.com/free-usabo-genetics-and-cell-biology-questions-and-answers) (11 questions)
- [USABO Plant Physiology and Photosynthesis 3](https://practicetestgeeks.com/usabo/questions/plant-physiology-and-photosynthesis-3) (7 questions)
- [USABO Plant Physiology and Photosynthesis 1](https://practicetestgeeks.com/usabo/questions/plant-physiology-and-photosynthesis) (7 questions)
- [USABO Plant Physiology and Photosynthesis 2](https://practicetestgeeks.com/usabo/questions/plant-physiology-and-photosynthesis-2) (7 questions)
- [USABO - USA Biology Olympiad Plant Anatomy and Transport Questions and Answers](https://practicetestgeeks.com/usabo-usa-biology-olympiad-plant-anatomy-and-transport-questions-and-answers) (6 questions)
- [USABO - USA Biology Olympiad Population Ecology and Dynamics Questions and Answers](https://practicetestgeeks.com/usabo-usa-biology-olympiad-population-ecology-and-dynamics-questions-and-answers) (6 questions)
- [USABO - USA Biology Olympiad Biosystematics and Taxonomy Questions and Answers](https://practicetestgeeks.com/usabo-usa-biology-olympiad-biosystematics-and-taxonomy-questions-and-answers) (6 questions)
- [USABO Immunology and Disease](https://practicetestgeeks.com/usabo-immunology-and-disease-practice-test) (6 questions)
- [USABO - USA Biology Olympiad Molecular Genetics and DNA Questions and Answers](https://practicetestgeeks.com/usabo-usa-biology-olympiad-molecular-genetics-and-dna-questions-and-answers) (6 questions)
- [USABO - USA Biology Olympiad Animal Physiology and Homeostasis Questions and Answers](https://practicetestgeeks.com/usabo-usa-biology-olympiad-animal-physiology-and-homeostasis-questions-and-answers) (6 questions)
- [USABO - USA Biology Olympiad Evolution and Phylogenetics Questions and Answers](https://practicetestgeeks.com/usabo-usa-biology-olympiad-evolution-and-phylogenetics-questions-and-answers) (6 questions)
- [USABO - USA Biology Olympiad Classical and Mendelian Genetics Questions and Answers](https://practicetestgeeks.com/usabo-usa-biology-olympiad-classical-and-mendelian-genetics-questions-and-answers) (6 questions)
- [USABO - USA Biology Olympiad Neurobiology and Sensory Systems Questions and Answers](https://practicetestgeeks.com/usabo-usa-biology-olympiad-neurobiology-and-sensory-systems-questions-and-answers) (6 questions)
- [USABO - USA Biology Olympiad Cellular Respiration and Metabolism Questions and Answers](https://practicetestgeeks.com/usabo-usa-biology-olympiad-cellular-respiration-and-metabolism-questions-and-answers) (6 questions)

## Articles & Study Guides

- [USABO Past Exams: Complete Guide to Practice Tests, Past Papers & Prep Strategy](https://practicetestgeeks.com/usabo/usabo-past-exams)
- [USABO 2026 Date: Complete Schedule, Registration Deadlines & Prep Guide](https://practicetestgeeks.com/usabo/usabo-2026-date)
- [USABO Study Guide: How to Prepare for the Biology Olympiad](https://practicetestgeeks.com/usabo/usabo-study-guide)
- [USABO Camp: USA Biology Olympiad Training Program Guide](https://practicetestgeeks.com/usabo/usabo-camp)
- [USABO Cutoffs: Score Requirements, Historical Data & How to Qualify](https://practicetestgeeks.com/usabo/usabo-cutoffs)
- [USABO Cutoff Scores: Complete Guide to Open Exam & Semifinal Qualifying Thresholds](https://practicetestgeeks.com/usabo/usabo-cutoff)
- [USABO Open Exam Answers: Past Exams, Practice Tests & 2017 Answer Guide](https://practicetestgeeks.com/usabo/usabo-open-exam-answers)
- [USABO Finalists: How to Become One and What Happens Next](https://practicetestgeeks.com/usabo/usabo-finalists)
- [USABO Registration: Complete Guide, Deadlines & Requirements](https://practicetestgeeks.com/usabo-registration-complete-guide-deadlines-requirements)

## Reference Pages

- [USABO USA Biology Olympiad Practice Test PDF (Free Printable 2026)](https://practicetestgeeks.com/usabo-usa-biology-olympiad/usabo-practice-test-pdf)
- [USABO Practice Test Video Answers](https://practicetestgeeks.com/usabo-practice-test-questions-video-answers)

## Exam Topic Domains

- Cell and Molecular Biology (8%)
- Anatomy and Physiology (5%)
- Ecology and Evolution (6%)

## About Practice Test Geeks

PracticeTestGeeks.com — free practice tests, exam simulations, and study guides for 5,000+ certifications and licensing exams. No signup. Questions include detailed explanations.

- Full category index: https://practicetestgeeks.com/llms.txt
- This category: https://practicetestgeeks.com/llms/usabo-usa-biology-olympiad.txt