2. List the three main parts of the cell and describe the function of each. a. b. c.

The three main parts of a cell are: a. **Cell Membrane**: The cell membrane is a protective barrier that surrounds the cell. It regulates the movement of substances in and out of the cell, maintaining homeostasis. The membrane is selectively permeable, allowing certain molecules to pass while blocking others, and it plays a crucial role in communication and signaling between cells. b. **Cytoplasm**: The cytoplasm is the gel-like substance that fills the interior of the cell, excluding the nucleus. It contains various organelles, enzymes, and other components necessary for cellular processes. The cytoplasm is the site of many metabolic reactions and provides a medium for the movement of materials within the cell. c. **Nucleus**: The nucleus is often referred to as the control center of the cell. It houses the cell's genetic material (DNA) and is responsible for regulating gene expression and cell division. The nucleus also contains the nucleolus, where ribosomal RNA is produced, and is surrounded by a nuclear envelope that controls the exchange of materials between the nucleus and the cytoplasm.