Topic 2 Cell theory

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Topic 2.1 IB Biology

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Topic 2 Cell theory

  1. 1. 2.1Cell Theory Scien cebitz. com Scien cebitz. com
  2. 2. Plant and animal cells The cell 2.1: Cell Theory Scien cebitz. com Nucleus Plasma Membrane CytoplasmMitochondria Vacuole containing sap Vacuole Membrane Cell wall Chloroplast Generalised animal cell Generalised plant cell
  3. 3. 2.1.1: Outline the cell theory. Three basic Principles All living things are made of cells. Cells are the smallest unit of life. Existing cells have come from other cells. Scien cebitz. com 2.1: Cell Theory
  4. 4. 2.1.2: Discuss the evidence for the cell theory. If you observe organisms under a microscope they consistently appear to be made of cells Scien cebitz. com 2.1: Cell Theory All living things are made of cells. http://botit.botany.wisc.edu/Resources/Botany/Cells%20and%20Tissues/Pinus%20Phloem/Sieves%20xs.jpg.html
  5. 5. 2.1.2: Discuss the evidence for the cell theory. Robert Hooke (1635-1703) Came up with the term “cells” after viewing cork under a microscope. Scien cebitz. com 2.1: Cell Theory All living things are made of cells. http://www.protopage.com/cellzmann#Untitled/Discovery
  6. 6. 2.1.2: Discuss the evidence for the cell theory. Antoni van Leeuwenhoek (1632 – 1723) Regarded as the “father of microbiology” Discovered “animalcules” in water with his microscope Scien cebitz. com 2.1: Cell Theory All living things are made of cells. http://oldschoolscience.wordpress.com/category/leeuwenhoek/
  7. 7. 2.1.2: Discuss the evidence for the cell theory. While organelles carry out metabolic function The cell components can not survive independently outside of the cell Scien cebitz. com 2.1: Cell Theory Cells are the smallest unit of life. http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/C/CellularRespiration.html
  8. 8. 2.1.2: Discuss the evidence for the cell theory. All cells carry out cell division Mitosis and meiosis in eukaryotic cells Binary Fission in prokaryotic cells Scien cebitz. com 2.1: Cell Theory Existing cells have come from other cells. http://www.glogster.com/reavisbradley/glog-5628/g-6n8hoa2d0jt9i4i6hetuqg8?old_view=True
  9. 9. 2.1.2: Discuss the evidence for the cell theory. Louis Pasteur proved in 1864 that life could not occur by spontaneous generation (e.g. that rats could form from sweaty grain) Scien cebitz. com 2.1: Cell Theory Existing cells have come from other cells. Remak a Jewish scientist discovered “cell division” when studying chicken embryos
  10. 10. 2.1.3 State that unicellular organisms carry out all the functions of life. metabolism: chemical reactions inside the cell, including cell respiration to release energy sensitivity: perceiving and responding to changes in the environment homeostasis: keeping conditions inside the organisms within tolerable limits Scien cebitz. com 2.1: Cell Theory Functions of life
  11. 11. 2.1.3 State that unicellular organisms carry out all the functions of life. growth: an irreversible increase in size reproduction: producing offspring either sexually or asexually nutrition: obtaining food, to provide energy and the materials needed for growth Scien cebitz. com 2.1: Cell Theory Functions of life
  12. 12. 2.1.3 State that unicellular organisms carry out all the functions of life. movement: via changes in size or appendages such as flagella, following stimulus or changes in turgor or full locomotion Scien cebitz. com 2.1: Cell Theory Functions of life

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