Diversity Of Cell Life
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Diversity Of Cell Life

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chapter 7 section 4 notes

chapter 7 section 4 notes

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Diversity Of Cell Life Diversity Of Cell Life Presentation Transcript

  • Diversity of Cell Life Chapter 7 Section 4 Pp 190-193
  • All living things….
    • Composed of cell(s)
    • Same basic chemistry
    • Same organelles
    • Follow same genetic code
    • But are all living things the same?
  • NO!
    • Differences come from:
      • Ways cells are specialized to do certain jobs
      • Way cells work with other cells to make a multicellular organism
  • Unicellular
    • Make up most life on earth
    • When a cell IS the organism
    • Single-celled/ unicellular
    • Do everything living thing does:
      • Respond to stimuli
      • Grow
      • Reproduce
      • Transform energy
  • Yeast
  • Volvox aureus
  • Leptospira interrogans
  • Multicellular Organism
    • Organism made up of many cells
    • Variety
    • Depend on 2 major things about cells:
      • Communication
      • Cooperation
    • Cell Specialization
      • Process in which cells throughout an organism perform different tasks
  • Specialized Animal Cells
    • Many specializations, for example:
      • Red Blood cells (rbc):
        • Specialized to transport oxygen
        • RBC have protein that binds to oxy in the lungs are carries it all over the body
  •  
      • Muscle cells:
        • Specialized in movement
        • What oragnelle is going to be big and important in these cells?
        • Cytoskeleton
        • Lots of the protein actin and myosin
    Specialized Animal Cells
  •  
      • Liver cells:
        • Specialized in detoxification
        • Have lots of what organelle?
        • Smooth ER
    Specialized Animal Cells
  •  
      • Pancreas cells:
        • Specialized in making proteins (enzymes)
        • Makes enzyme that are needed by digestive system to break down food
        • What three organelles are pancreatic cells loaded with (if their main function is making proteins)?
        • Ribosomes. Rough ER, Golgi Apparatus
    Specialized Animal Cells
  •  
  • Specialized Plant cells
    • Lots of chemical activity all the time
    • Exchanges carbon dioxide, water vapor, oxygen, and other gases through tiny pores called…?
      • STOMATA
      • Found underside of leaves
    • Guard Cells:
      • Highly specialized cells that regulate process of gas exchange at the stomatas
      • They monitor plants internal conditions and regulate stomata accordingly
        • If plant needs gas exchange, what will happen to the stomata?
          • open
  •  
  • Levels of Organization
    • Makes it easier to describe cells in a multicellular organism
      • Cells- basic unit of living things
      • Tissues- group of similar cells that perform a specific function
      • Organs- group of tissues working together to perform a specific function
      • Organ systems- group of organs that work together to perform a specific function
      • ORGANISM
  •  
  •  
  • Osmotic Pressure
    • Pressure exerted by osmosis on the HYPERTONIC side of a semi-permeable membrane
    • Can cause serious problems for cell
      • Cell is full of sugar, salts, proteins, molecules
      • Inside of cell is Hypertonic
      • Osmotic pressure should make fresh water go…?
      • In or Out?
      • In
      • Cell will become inflated/swollen
      • Too much  cell will burst like a balloon
  • Why don’t all our cells burst?
    • What are our cells (animal) contained in?
      • Fresh water?
      • No…..blood or other fluids, which are ISOTONIC
        • The conc. Of sugars, salts, proteins and molecules in these fluids is the same as the conc. in the cell
    • Bacteria and plant cells
      • They DO come in contact with fresh water…what do they have PROTECTING them?
      • CELL WALL
        • Prevent cells from expanding even when there’s a lot of osmotic pressure
        • But, cell walls are prone to injuries when there is too much osmotic pressure
  •  
    • Which is a RBC in isotonic solution?
    • RBC in hypertonic solution?
    • RBC in hypotonic solution?
  •  
  • Study for Chapter 7 Test!!!