HESI A2 Biology 2026 Exam Questions and Answers (25+ Verified Q&A) | Cell Biology, Genetics, Cellular Respiration, DNA, Microscopy & Transport Mechanisms

This comprehensive HESI A2 Biology 2026 study guide contains more than 25 carefully selected biology exam questions and answers covering the fundamental concepts most frequently tested on the HESI Admission Assessment (A2) Biology section. The resource is designed to help nursing school applicants and allied health students strengthen their understanding of cell structure and function, genetics, molecular biology, cellular processes, and biological organization. The question-and-answer format provides an efficient review method for reinforcing key concepts and improving examination performance. The document covers essential cell biology topics including eukaryotic cells, cellular organelles, cell membranes, cell walls, Golgi apparatus function, vacuoles, cytoskeleton structure, and the role of mitochondria in ATP production. Students will review mechanisms of passive transport, facilitated diffusion, concentration gradients, hypertonic solutions, membrane permeability, and cellular homeostasis—concepts that form the foundation of anatomy, physiology, microbiology, and nursing education. Genetics and molecular biology sections focus on DNA structure, nucleotide composition, genetic information storage, DNA replication, alleles, phenotypes, heredity, chromosome numbers, gamete formation, and nitrogenous bases. The guide also introduces students to transcription-related concepts, phospholipid bilayer structure, and genetic inheritance principles that are frequently assessed in healthcare entrance examinations. These topics provide foundational knowledge necessary for understanding human biology, disease processes, and advanced nursing coursework. Additional content reviews cellular respiration, glycolysis, microscopy fundamentals, biological structure and function relationships, levels of biological organization, flagellar movement, and reproductive cell biology. The material is particularly valuable for students seeking a concise yet focused review of high-yield HESI A2 Biology concepts before examination day. By practicing these questions, students can strengthen scientific reasoning skills, improve content retention, and build confidence for nursing school entrance assessments. This resource is ideal for students preparing for the HESI A2 Admission Assessment, nursing school entrance examinations, allied health admissions testing, pre-nursing coursework, biology placement examinations, and healthcare program prerequisite assessments. Relevant For: HESI A2 Candidates Pre-Nursing Students Nursing School Applicants BSN Program Applicants ADN Program Applicants LPN/LVN Program Applicants Allied Health Students Health Sciences Students Pre-Medical Students Healthcare Career Program Applicants Biology Students Anatomy and Physiology Students College Entrance Examination Candidates Academic References: Elsevier HESI Admission Assessment Exam Review. Campbell Biology (Urry, Cain, Wasserman, Minorsky & Orr). OpenStax Biology 2e. Alberts B. Molecular Biology of the Cell. Raven PH, Johnson GB. Biology. Mader's Biology. Journal of Biological Education. CBE—Life Sciences Education. Nature Reviews Molecular Cell Biology. American Biology Teacher. Keywords: HESI A2 biology, HESI biology exam, HESI biology questions, HESI biology answers, HESI admission assessment, nursing school entrance exam, biology study guide, cell biology, genetics, DNA structure, DNA replication, heredity, alleles, phenotypes, nucleotides, chromosomes, gametes, cellular respiration, glycolysis, ATP production, mitochondria, cell membrane, cell wall, Golgi apparatus, vacuole, cytoskeleton, passive transport, facilitated diffusion, osmosis, hypertonic solution, phospholipid bilayer, eukaryotic cells, microscopy, microscope questions, biological organization, flagellum, molecular biology, nursing entrance preparation, allied health admissions, science exam review, healthcare entrance testing