Ultrastructure of Cells

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    14-Jul-2015

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  • ULTRASTRUCTURE OF CELLSFOR THE 2016 IB SYLLABUS

    www.ibscrewed.org

  • PROKARYOTIC CELL

    Single-celled prokaryotic cells have a very simple structure

    All the DNA and other chemicals of life float freely in the cytoplasm: there are no organelles

    There is no compartmentalisation

    They divide by binary fission

  • DRAWING PROKARYOTES

    Example:

    The most important elements are: cell wall, pili and flagella, plasma membrane, cytoplasm, 70S ribosomes and naked loop of DNA

  • EUKARYOTIC CELLS

    Eukaryotic cells have a compartmentalised structure, with membrane-bound organelles

    They often join together to form multicellular organisms

    Eukaryotes are usually larger than prokaryotes

  • DRAWING EUKARYOTES

    Example:

    The most important elements are: plasma membrane, cytoplasm, 80S ribosomes, nucleus, mitochondria, some other organelles

  • PROKARYOTES VS. EUKARYOTES

    Both have: cell membranes, DNA, ribosomes, metabolism, and cytoplasm

    Differences include: prokaryotes have cell walls (and eukaryotic plant cells), eukaryotes have histone-bound DNA, prokaryotic DNA is in a single loop, eukaryotic DNA is found in chromosomes

  • ELECTRON MICROSCOPES

    Electron microscopes have much higher resolution than light microscopes

    They are used to take images of the ultrastructure of cells

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