The document lists and describes the main organelles found in cells including the nucleus, mitochondria, cell membrane, chloroplasts, and vacuoles. It also explains that the cell membrane is made of lipids with hydrophilic heads and hydrophobic tails that can self-repair, and contains integral membrane proteins that function in roles like cell signaling, enzymes, and transport. Additionally, it defines organic molecules as chemicals containing carbon and hydrogen while inorganic molecules do not contain carbon and are not of biological origin, providing examples such as ammonia and carbon dioxide.