The cell membrane regulates the movement of water, nutrients and wastes into and out of the cell. Inside of the cell membrane are the working parts of the cell. At the center of the cell is the cell nucleus . The cell nucleus contains the cell's DNA , the genetic code that coordinates protein synthesis. One important cellular organelle is the ribosome .
Ribosomes participate in protein synthesis.
The transcription phase of protein synthesis takes places in the cell nucleus. After this step is complete, the mRNA leaves the nucleus and travels to the cell's ribosomes, where translation occurs. Another important cellular organelle is the mitochondrion . Also important in the life of a cell are the lysosomes . Lysosomes are organelles that contain enzymes that aid in the digestion of nutrient molecules and other materials.