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Cells: The Basic Units of Life

Cells: The Basic Units of Life. Unicellular Organisms. Bacteria Protozoa Paramecium Ameba. The following video clip has been removed: Cells: The Basic Units of Life, Unicellular Organisms, United Learning (1994. Multicellular Organisms.

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Cells: The Basic Units of Life

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  1. Cells: The Basic Units of Life

  2. Unicellular Organisms • Bacteria • Protozoa • Paramecium • Ameba The following video clip has been removed: Cells: The Basic Units of Life, Unicellular Organisms, United Learning (1994.

  3. Multicellular Organisms • Many cells join together to perform specialized tasks • Cells of the same type join together to form layers, called tissues The following video clip has been removed: Cells: The Basic Units of Life, Many-celled Organisms, United Learning (1994).

  4. Early Scientists’ Contributions • In 1655, Robert Hooke coins the term "cell" to describe chambers in cork • In 1674,Anton Von Leeuwenhoek perfects techniques for grinding a microscope lens to make the first microscope • In 1838,Mathais Schleiden concluded that plants are composed of cells • In 1839,Theodore Schwann concluded that animals are composed of cells

  5. Cell Theory • All living things are made of one or more cells • Cells are the basic units of structure and function of living things • All cells come from existing cells

  6. What are the characteristics of living things? All living things… • Grow • Repair and maintain themselves • Reproduce • Undergo change • Move • Respond to surroundings • Grow old and die.

  7. Unicellular Organism Plant Cell Animal Cell Cells: The Basic Units of Life

  8. Relative Size of a Eukaryotic Cell Remember: 1,000 nanometers (nm) = 1 micron (µm) 1,000 microns (µm) = 1 millimeter (mm)

  9. Web Resources • The Biology Project • Cells Alive Check it out Check it out

  10. Cell Quiz

  11. Cells are made up of simple components that work independently to keep the cell alive. A. True B. False

  12. Which of the following is true about tissues? A. Tissues are composed of unicellular organisms. B. Tissues are made of specialized groups of cells specific to each type of tissue. C. Animal tissue is composed of cells, but plants do not have tissues. D. The cells of different kinds of tissues are the same.

  13. Which of the following is NOT a part of the cell theory as developed by Schleiden and Schwann? A. All living organisms are made up of cells. B. All new cells are created from existing cells. C. All living organisms have a finite number of cells they are born with. D. Cells are the units of structure and organization in living organisms.

  14. Credits Cells: The Basic Units of Life. United Learning (1994). Retrieved March 7, 2009, from Discovery Education: http://streaming.discoveryeducation.com/ Cell, plant. Paul Fuqua (2004). Retrieved March 8, 2009, fromDiscovery Education: http://streaming.discoveryeducation.com/ Cell, animal. Paul Fuqua (2004). Retrieved March 8, 2009, from Discovery Education: http://streaming.discoveryeducation.com/ Radiolaria. Jupiterimages Corporation (2006). Retrieved March 8, 2009, from Discovery Education: http://streaming.discoveryeducation.com/ How big are molecular parts? (2001) Department of Biology, Davidson College. Retrieved March 8, 2009, from http://www.bio.davidson.edu/COURSES/genomics/method/sizes.html

  15. Correct

  16. Incorrect

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