The document summarizes the structures and functions of various cell organelles: - The cell membrane is a phospholipid bilayer that protects the cell and regulates what enters and exits. - The mitochondria have an inner and outer membrane and produce ATP through cellular respiration. - The endoplasmic reticulum transports and packages proteins, lipids, and other molecules. The rough ER has ribosomes and produces proteins. - Ribosomes are found free in the cytoplasm or attached to the ER and are the site of protein synthesis. - The Golgi body modifies and packages proteins and lipids for transport within the cell. - Vesicles and vacuoles transport materials within the cell for storage or waste disposal. Lysosomes