Bio

• Organ


  A group of different tissues that work together to perform a function
• Tissue


  A group of cells that perform a similar function
• Cell


  The basic unit of structure and function in living things
• Organelle


  One of many cell structures that have a specialized function
• Macromolecule


  A large, complex molecule; essential molecule for life's processes/structures
• Molecule


  Different atoms that are chemically bonded together
• Atom


  Basic unit of matter; building blocks of molecules
• Cell membrane - a lipid bilayer with embedded proteins. The basic function is to protect the cell from its surroundings
• Nucleus - the control center, telling all of the other organelles what to do and when to do it
• Nucleolus - located within the nucleus of eukaryotic cells. The site of ribosome formation
• Mitochondria - the powerhouse of the cell. The process produces energy stored in a small molecule called adenosine triphosphate (ATP), and is called cellular respiration
• Chromosomes - found in the nucleus. DNA is elongated into very thin, hair-like structures when the cell is in its growing phase. When the cell is getting ready to divide, the DNA condenses into chromosomes and the material gets duplicated
• Endoplasmic reticulum (E.R.) - a collection of lipid membranes that work to move the proteins from one area of the cell to another. The E.R. comes in two different forms - rough and smooth
• Golgi apparatus (or Golgi bodies) - looks like a stack of pancakes. The Golgi apparatus changes, sorts and packages the proteins as they leave the E.R. so they are ready to leave the cell
• Cytoskeleton - Network of tiny tubes within the cytoplasm used to give the cell structure. It also supports the organelles by holding them into place
• Lysosomes - organelles that contain digestive enzymes. They digest excess or worn-out organelles, food particles, and engulfed viruses or bacteria
• Cell wall - the structural layer just outside the cell membrane. It can be tough, flexible, and sometimes rigid. It provides the cell with both structural support and protection and acts as a filtering mechanism
• Vacuole - membrane-bound structures, or enclosed compartments that are filled with both inorganic and organic molecules, and with water to support the organelle
• Chloroplasts - plastids that contain chlorophyll and in which photosynthesis takes place