What I Have Learned Directions: Complete the following sentences to identify the functions of the cell organelles The control center of the cell which contains DNA is the (1___) while the (2_) controls the passage of materials in and out of the cell. Everything inside of the cell membrane except for the nucleus is the (3) found. The function of (4) where the organelles are powerhouse of the cell. On the other hand, (5) is to produce energy also known as the provide as the storage of water and other materials and (6_) contains substance that breaks down the materials

Ideas about cell structure have changed considerably over the years. Early biologists saw cells as simple membranous sacs containing fluid and a few floating particles. Today's biologists know that cells are infinitely more complex than this.Every cell in the body is enclosed by a cell (Plasma) membrane. The cell membrane separates the material outside the cell, extracellular, from the material inside the cell, intracellular. It maintains the integrity of a cell and controls passage of materials into and out of the cell. All materials within a cell must have access to the cell membrane (the cell's boundary) for the needed exchange.

The cell membrane is a double layer of phospholipid molecules. Proteins in the cell membrane provide structural support, form channels for passage of materials, act as receptor sites, function as carrier molecules, and provide identification markers.