Organelles

Nucleus

store and protect DNA; partial formation of ribosomes

Smooth ER

formation and breakdown of lipids; detoxification of liver; steroid hormone synthesis in gonads

Rough ER

location of protein synthesis; covered in ribosomes

Golgi apparatus

modification and packing of proteins, especially for secretion

Ribosomes

formation of proteins

Lysosomes

garbage disposal system of cell

Mitochondria

production of energy via Krebs cycle and ETC

Peroxisomes

metabolize lipids and toxins using peroxides

microtubule structure

polymers of alpha- and beta-tubulin; wider than microfilaments

microtubule function

maintain cell structure, cilia and flagella, intracellular transport, mitotic spindles

microfilament structure

two strands of actin polymers; thin, strong, flexible

microfilament function

movement of cell, endo- and exocytosis, cell cleavage, muscle contraction

intermediate filament structure

monomer has head, tail and long center; can be single, two aligned, or many

intermediate filament function

structural support, cell adhesion