CELLS Smallest unit of life that can carry
- Slides: 19
CELLS Smallest unit of life that can carry out all the functions of an organism.
History of the Cell: • 1665 – Robert Hooke discovered and described the fundamental unit of all living things (cells) by using thin slices of cork. • He gave the tiny chambers the name “cell” because it reminded him of a monastery's tiny room which were known as cells.
History of the Cell: • 1674 – Anton Van Leeuwenhoek (“Father of Microbiology”) was the first man to witness a live cell under a microscope. • He made many different types of single lens microscopes that could magnify up to 300 X. • When observing pond water, he discovered tiny organisms he called "animalcules. ”
History of the Cell:
History of the Cell: • 1838: Matthias Schleiden (Botanist) concluded that all plants are made out of cells.
History of the Cell: • 1839: Theodor Schwann (Zoologist) concluded that ALL organisms including animals are made up of cells.
History of the Cell: • 1855: Rudolph Virchow (Doctor) – proposed that all cells arise from existing cells. – Until 1855: Schleiden and Schwann believed that cells might “crystallize out” from fluids.
These discoveries, confirmed by other biologists, are summarized in the CELL THEORY
What is the Cell Theory? A fundamental concept in biology that states: 1. Cells are the basic units of life (Hooke) 2. All organisms are made of cells (Schleiden &Schwann) 3. All cells come from existing (other) cells (Virchow)
Examples of Cells Amoeba Proteus Plant Stem Bacteria Red Blood Cell Nerve Cell
Part of the Microscope
Parts of the Microscope A. Occular (eye piece) B. Body Tube C. Revolving Nosepiece D. Objective Lenses E. Stage F. Diaphragm (controls amount of light)
Parts of the Microscope G. Light source H. Base I. Fine Adjustment knob J. Coarse Adjustment Knob K. Stage Clips (holds slides) L. Arm
Carrying a Microscope
Magnification increases the apparent size of a specimen when you view it through the microscope. Calculating Magnification ØMagnification of objective lens X occular lens magnification
Since microscopes magnify cells we have a new unit of measurement. These new units are called microns. 1 mm 1 1000 = = 1000 µm 1 µm We can use microscopes to estimate the size of cells we are looking at.
Example a)if the Field fieldof view = 1 mm Onion cell 1 mm (1000 µm) then 0. 5 onion cells are _______ mm 500 microns or _______(µm) in length
b)if the field of view = 0. 5 mm or 500µm then these cheek cells would be 500 5 100 µm in length mm or _______ Human cheek cell 0. 5 mm (500 µm)
- Cells are the smallest unit of life
- Cells are the smallest unit of life
- Cells are the smallest unit of life
- What is the smallest unit of a living organism?
- Smallest functional unit of life *
- Smallest unit of life
- What is the smallest living unit in all organisms?
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