2. Cell Vocab A: Cell Membrane – Structure that surrounds and protects the cell – The limiting membrane of the cell; retains internal structure; permits exploration and importation of materials. Composed primarily of lipid and protein, and a smaller amount of carbohydrate E: Nucleolus – Produces ribosomes – A mass of largely RNA (some DNA and protein)in the nucleus producing units of RNA which combine in the cytoplasm to form ribosomes

3. Cell Vocab F: Cytoplasm – Materials within the cell membrane that are not a part of the nucleus G: Smooth and Rough Endoplasmic Reticulum – Network of canals in the cytoplasm – Membrane lined tubules to which ribosomes may be attached – Rough ER: concerned with transport of protein synthasized at the ribosomes – Smooth ER: sysnthasizes complex molecules called steroids in some cells, calcium ions in muscles, break down toxins in liver

4. Cell Vocab H: Ribosome – Protein producers – The site of protein synthesis where amino acids are strung in sequence as directed by messenger RNA from the nucleus I: Golgi Complex – Transports and delivers proteins – (or apparatus) flattened membrane-lined sacs which bud off small vesicles from the edges; collect secretory products and package them for export or cell use

5. Cell Vocab J: Mitochondrion – Power houses of cell, supplies the energy – Membranous, oblong structure in which the inner membrane is convoluted like a maze. Energy for cell operations is generated here through a complex series of reactions between oxygen and products of digestion L: Lysosome – Breakdown of molecules – Membrane-lined container of enzymes with great capacity to break down structure, especially ingested foreign substances

6. Cell Vocab C: Nuclear Membrane – Porous membrane of similar construction to the cell membrane; the limiting membrane of the nucleus, separating it from the cytoplasm; regulates passage of molecules