The document defines and describes key cellular organelles and structures: - The nucleus contains DNA and manages cellular functions. The nucleolus produces ribosomes. - The cell membrane filters materials in and out of the cell. The cytoplasm contains organelles and chemical reactions. - Organelles like the endoplasmic reticulum, Golgi apparatus, vacuoles, lysosomes, chloroplasts, and mitochondria have specific functions in protein synthesis, transport, storage, and energy production. - The cytoskeleton, composed of microtubules and microfilaments, provides structural support. Plastids store materials. Centrioles and cilia/flagella are involved in cell movement. The cell wall surrounds plant cells