The document provides an overview of key cell organelles and their functions, including the cell membrane, nucleus, cytoplasm, mitochondria, Golgi complex, ribosomes, smooth endoplasmic reticulum, rough endoplasmic reticulum, lysosome, cell wall, chloroplast, and central vacuole. It explains that organelles are membrane-bound structures that carry out specific activities for the cell and defines the basic roles of each organelle such as the nucleus housing DNA, mitochondria generating energy, and the Golgi complex packaging and transporting proteins.

1. Cell Organelles What you need to know

2. An organelle is a membrane-bound structure that carries out specific activities for the cell.