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A one-celled organism

A one-celled organism. Standard 4 key idea 1 performance indicator 1.1 major understanding 1.3a. Bell Ringer. True or false? All prokaryotes are one-celled (unicellular.) 2. All eukaryotes are multicellular. True. False: Some eukaryotes such as protists are unicellular.

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A one-celled organism

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  1. A one-celled organism Standard 4 key idea 1 performance indicator 1.1 major understanding 1.3a

  2. Bell Ringer • True or false? • All prokaryotes are one-celled (unicellular.) 2. All eukaryotes are multicellular. True False: Some eukaryotes such as protists are unicellular.

  3. A one-cell (unicellular) organism Prokaryotic unicellular organisms: bacteria and archaea. All prokaryotic organisms are unicellular. Eukaryotic unicellular organisms: Protists and some fungi are unicellular.

  4. Prokaryotic unicellular organisms: bacteria and archaea. http://www.nicerweb.com/bio1100b/Locked/media/ch01/kingdom_Archaea.html http://www.scilogs.com/from_the_lab_bench/computers-and-electrifying-bacteria/

  5. Eukaryotic unicellular organisms: Protists and some fungi • Examples: ameba and paramecium http://www.microscope-microscope.org/gallery/Mark-Simmons/pages/paramecium2.htm http://www.microscopy-uk.org.uk/mag/indexmag.html?http://www.microscopy-uk.org.uk/mag/wimsmall/sundr.html

  6. A one-celled organism is able to function despite lacking the levels of organization present in more complex organisms.  In other words, a unicellular organism does not have tissues, organs, and organ systems that are found in multicellular organisms.

  7. The structures present in some singled-celled organisms act in a manner similar to the tissues and systems found in multicellular organisms. This enables them to perform all of the life processes needed to maintain homeostasis. What does this mean?  next page

  8. Example: the paramecium

  9. Sample question • The excretory organelles of some unicellular organisms are contractile vacuoles and • cell membranes • ribosome • cell walls • centrioles (1) Cell membranes

  10. Exit ticket Pick an organelle of a paramecium and write its function. Write an organ or organ system of humans that is equivalent (has the same function) of your choice of organelle.

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