Biology Chapter 4

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missancy
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90944
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Biology Chapter 4
Updated:
2011-06-16 20:30:59
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Biology
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Biology Exam # 2
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  1. What is cell theory?
    All living things are made of cells.
  2. List 2 differences between prokaryotic and eukaryotic cells.
    • Prokaryotic does not have a nucleus and has few organelles.
    • Eukaryotic have a nucleus and has many organelles.
  3. How many layers of phospholipids do cell membranes have?
    2
  4. Draw a picture of the phospholipid bilayer.
  5. Name 2 functions of the membrane proteins.
    Transport molecules across the membrane and they act as attachment points for other cells.
  6. Name 2 functions of the plasma membrane.
    • Separates the contents of the cell from the external enviroment.
    • Metabolic activities
    • Transports molecules across the membrane
  7. Name the function of the ER
    Provides a large surface area for important chemical reactions.
  8. Name the function of the Golgi Apparatus
    Packages and ships molecules throughout the cell.
  9. Name the function of the Lysosomes
    Digests macromolecules.
  10. Name the function of Peroxisomes.
    Breaks down hydrogen peroxide.
  11. Name the function of the Vaculoles
    Large membrane enclosed sacs that are storage sites of food and water.
  12. Name the function of the Nuclear Membrane
    Separates the genetic material from the rest of the cell.
  13. Name the function of the Mitochondrion
    Makes energy and is involved with respiration.
  14. Name the function of the Chloroplasts
    Photosynthesis.
  15. Name the function of the Ribosomes.
    Takes RNA and makes into protein (Translation).
  16. Name the function of the Cytoskeleton.
    Provides shape, support, and movement.
  17. Name the function of the Cilia and Flagella.
    Involved with movement of a single cell or the enviroment.
  18. Name 6 ways to get through a membrane.
    • Diffusion
    • Facilitated Diffusion
    • Osmosis
    • Active Transport
    • Endocytosis
    • Exocytosis
  19. What is diffusion?
    The net movement of molecules from a high concentrated area to a lower concentration.
  20. What is facilitated diffusion?
    • Some molecules have to be carried across the membrane. (Like a tunnel is created)
    • Doesn't require energy.
  21. What is Osmosis?
    The diffusion of water through a permeable membrane.
  22. What is active transport?
    • Moves molecules across a membrane, UP their concentration gradient.
    • Opposite of diffusion
    • Requires the input of energy
  23. What is endocytosis?
    Moves large molecules or sets of molecules into the cell.
  24. What is exocytosis?
    Moves large molecules or sets of molecules out of the cell.

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