AP Biology Unit 2

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Across
  1. 3. break down various substances, including hydrogen peroxide (H202), fatty acids, and amino acids; common in liver and kidney cells; in plant cells, these modify by-products of photorespiration
  2. 6. vesicles from a Golgi apparatus that contain digestive enzymes; break down food, cellular debris, and foreign invaders such as bacteria; a low pH is favorable;do NOT occur in PLANT cells
  3. 7. made of protein tubulin; provide support and motility for cellular activites; found in the spindle apparatus
  4. 9. structures that protrude from the cell membrane; long, few, move in a snakelike motion; 9+2 array; Ex: propels sperm
Down
  1. 1. contains nuclear envelope, DNA (spread out w/in this as the threadlike matrix chromatin)
  2. 2. kind of anchoring junction; consists of proteins that bind adjacent cells together, providing mech. stability to tissues; associated w/protein filaments that extend into the interior of the cell and serve to hold cellular strucures together
  3. 3. narrow channels between PLANT cells; a narrow tube of ER surrounded by cytoplasm and the plasma membrane passes thru the channel; material exhange occurs thru the cytoplasm surrounding the demotubule
  4. 4. manufactured in the nucleus; consists of RNA molecs and proteins; in the cytoplasm, this assists in the assembly of amino acids into proteins
  5. 5. small, sphericaly shaped sacs that bud from the outside surface of the Golgi apparatus; often migrate to and merge with the plasma membrane, releasing their contens to the outside of the cell
  6. 8. structures that protrude from the cell membrane; short, many, move with a back and forth movement; 9+2 array; Ex: line the resp. tract and sweep away debris