["Nucleus. The nucleus can be thought of as the cell's headquarters. ... ", 'Plasma membrane. To ensure each cell remains separate from its neighbor, it is enveloped in a special membrane known as the plasma membrane. ... ', 'Cytoplasm. ... ', 'Lysosomes and peroxisomes. ... ', 'Cytoskeleton. ... ', 'Endoplasmic reticulum. ... ', 'Golgi apparatus. ... ', 'Mitochondria.']