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Diptipresentation24

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  • 1. The Cell Dr. DIPTI JOSHI ASST.PROFESSOR in ZOOLOGY BIOLOGY DEPARTMENT, GUJARAT ARTS & SCIENCE COLLEGE AHMEDABAD
  • 2. Cell Structure & Function http://koning.ecsu.ctstateu.edu/cell/cell.html
  • 3. Cell Theory
    • All living things are made up of cells.
    • Cells are the smallest working units of all living things.
    • All cells come from preexisting cells through cell division.
  • 4. Definition of Cell A cell is the smallest unit that is capable of performing life functions.
  • 5. Examples of Cells Amoeba Proteus Plant Stem Red Blood Cell Nerve Cell Bacteria
  • 6. Two Types of Cells
    • Prokaryotic
    • Eukaryotic
  • 7. Prokaryotic
    • Do not have structures surrounded by membranes
    • Few internal structures
    • One-celled organisms, Bacteria
    http://library.thinkquest.org/C004535/prokaryotic_cells.html
  • 8. Eukaryotic
    • Contain organelles surrounded by membranes
    • Most living organisms
    Plant Animal http://library.thinkquest.org/C004535/eukaryotic_cells.html
  • 9. “ Typical” Animal Cell http://web.jjay.cuny.edu /~ acarpi/NSC/images/cell.gif
  • 10. “ Typical” Plant Cell http://waynesword.palomar.edu/images/plant3.gif
  • 11. Cell Parts Organelles
  • 12. Surrounding the Cell
  • 13. Cell Membrane
    • Outer membrane of cell that controls movement in and out of the cell
    • Double layer
    http://library.thinkquest.org/12413/structures.html
  • 14. Cell Wall
    • Most commonly found in plant cells & bacteria
    • Supports & protects cells
    http://library.thinkquest.org/12413/structures.html
  • 15. Inside the Cell
  • 16. Nucleus
    • Directs cell activities
    • Separated from cytoplasm by nuclear membrane
    • Contains genetic material - DNA
  • 17. Nuclear Membrane
    • Surrounds nucleus
    • Made of two layers
    • Openings allow material to enter and leave nucleus
    http://library.thinkquest.org/12413/structures.html
  • 18. Chromosomes
    • In nucleus
    • Made of DNA
    • Contain instructions for traits & characteristics
    http://library.thinkquest.org/12413/structures.html
  • 19. Nucleolus
    • Inside nucleus
    • Contains RNA to build proteins
    http://library.thinkquest.org/12413/structures.html
  • 20. Cytoplasm
    • Gel-like mixture
    • Surrounded by cell membrane
    • Contains hereditary material
  • 21. Endoplasmic Reticulum
    • Moves materials around in cell
    • Smooth type: lacks ribosomes
    • Rough type (pictured): ribosomes embedded in surface
    http://library.thinkquest.org/12413/structures.html
  • 22. Ribosomes
    • Each cell contains thousands
    • Make proteins
    • Found on ribosomes & floating throughout the cell
    http://library.thinkquest.org/12413/structures.html
  • 23. Mitochondria
    • Produces energy through chemical reactions – breaking down fats & carbohydrates
    • Controls level of water and other materials in cell
    • Recycles and decomposes proteins, fats, and carbohydrates
    http://library.thinkquest.org/12413/structures.html
  • 24. Golgi Bodies
    • Protein 'packaging plant'
    • Move materials within the cell
    • Move materials out of the cell
    http://library.thinkquest.org/12413/structures.html
  • 25. Lysosome
    • Digestive 'plant' for proteins, fats, and carbohydrates
    • Transports undigested material to cell membrane for removal
    • Cell breaks down if lysosome explodes
    http://
  • 26. Vacuoles
    • Membrane-bound sacs for storage, digestion, and waste removal
    • Contains water solution
    • Help plants maintain shape
    http://library.thinkquest.org/12413/structures.html
  • 27. Chloroplast
    • Usually found in plant cells
    • Contains green chlorophyll
    • Where photosynthesis takes place
  • 28. Thanks