Biology organelle structure and function lesson for grades 6–12 covering nucleus, cytoskeleton, endomembrane system, ribosomes. 5 activities, teacher guide, answer key. NGSS aligned MS-LS1-2 HS-LS1-1 HS-LS1-2. Topics covered:• Nucleus (DNA control center) and Cytoskeleton (microfilaments, intermediate filaments, microtubules) • Endomembrane system (ER, Golgi, lysosomes, vesicles, plasma membrane, Phagocytosis & cellular transport) • Ribosomes What’s included:• 10 pages content (clear explana