BIO 251 – Anatomy & Physiology | Exam Q&A (48) | Organelles, Membranes, Transport – 2025/2026

This document contains 48 verified and accurately answered exam questions from BIO 251: Anatomy & Physiology, Chapter 3, for the 2025/2026 academic year. It provides a detailed overview of cellular structure and function, focusing on organelles, membrane dynamics, and mechanisms of molecular transport. Key structures covered include the endoplasmic reticulum, ribosomes, mitochondria, lysosomes, Golgi apparatus, cytoskeleton, and the nucleus. The document clearly explains the role of each component in maintaining cellular function. Additionally, it covers membrane physiology, including passive and active transport mechanisms such as diffusion, osmosis, facilitated diffusion, filtration, endocytosis, and exocytosis. It also explores tonicity (hypotonic, hypertonic, isotonic solutions), the cell cycle (G1, S, G2, mitosis, cytokinesis), and the processes of cell differentiation, apoptosis, and the role of stem and progenitor cells. Each concept is presented in a Q&A format, ideal for active recall and revision. This resource is suitable for students in Nursing, Allied Health, Biology, Pre-Med, Biomedical Sciences, and anyone enrolled in Anatomy & Physiology I courses. It is an excellent tool for exam preparation, midterm review, or reinforcing key concepts taught in class. Keywords: cell organelles, endoplasmic reticulum, ribosomes, mitochondria, lysosomes, Golgi apparatus, cytoskeleton, nucleus, chromatin, plasma membrane, membrane proteins, cell junctions, passive transport, active transport, osmosis, diffusion, exocytosis, endocytosis, phagocytosis, pinocytosis, isotonic, hypotonic, hypertonic, cell cycle, mitosis, interphase, prophase, metaphase, anaphase, telophase, cytokinesis, stem cells, cell differentiation, apoptosis