Nbme Cbse Real Exam Complete Usmle Step 1 Medical Exam Prep | 200 Verified Questions And Answers | A+ Graded

NBME CBSE Real Exam - 200 Questions and Answers | Latest 2025/2026 | Complete USMLE Step 1 Medical Examination Prep | Verified and A+ Graded Section 1: Introduction This document includes the complete and verified set of 200 real NBME CBSE (Comprehensive Basic Science Examination) questions and 100% correct answers, aligned with the 2025/2026 USMLE Step 1 preparation standards. It comprehensively covers all major disciplines tested on the Step 1 exam: Anatomy, Physiology, Biochemistry, Pathology, Pharmacology, Microbiology, Behavioral Sciences, and Interdisciplinary topics (e.g., genetics, nutrition, epidemiology). This A+ graded and physician-reviewed guide replicates the actual CBSE format and is an essential tool for medical students aiming to benchmark Step 1 readiness with confidence. Section 2: Exam Questions and Answers Format: 200 multiple-choice questions Four answer choices per question (A-D) Correct answer highlighted in green Explanations included where applicable to reinforce foundational sciences 1. What structure connects the middle ear to the nasopharynx? A) Cochlea B) Eustachian tube C) Semicircular canals D) Tympanic membrane B) Eustachian tube (Explanation: The Eustachian tube equalizes pressure in the middle ear and drains secretions into the nasopharynx.) 2. Which ion is primarily responsible for depolarization in cardiac myocytes? A) Potassium (K+) B) Sodium (Na+) C)