1 cell theory and structure 2 1. all living things are made of cells 2. cells are the basic unit of...
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Cell Theory1. All living things are made of cells2. Cells are the basic unit of structure and
function in an organism (basic unit of life)3. Cells come from the reproduction of
existing cells (cell division)
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History of Cells & the Cell Theory
In 1665, Robert Hooke used a microscope to examine a thin slice of cork (dead plant cell walls)
What he saw looked like small boxes Hooke is responsible for naming cells In 1673, Leeuwenhoek was first to view
living organisms Leeuwenhoek used a simple, handheld
microscope to view pond water & scrapings from his teeth
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SCHLEIDEN, SCHWANN &
VIRCHOW In 1838, a German botanist named Matthias Schleiden concluded that all plants were made of cells
In 1839, a German zoologist named Theodore Schwann concluded that all animals were made of cells
In 1855, a German medical doctor named Rudolph Virchow observed, under the microscope, cells dividing
He reasoned that all cells come from other pre-existing cells by cell division
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Remember Endosymbiotic Theory
In 1970, American biologist, Lynn Margulis, provided evidence that some organelles within cells were at one time free living cells themselves – this is called Endosymbiotic Theory
Chloroplasts and mitochondria were the organelles she pointed to as evidence of this theory
Chloroplast and Mitochondria have their own DNA which is different from the DNA of the cell 6
Number of Cells
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• Unicellular – composed of one cell
Ex: bacteria, yeast
• Multicellular - composed of many cells that may organize
Ex: butterfly, flower
Prokaryotes
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• Have a nucleoid region contains the DNA (no nucleus)
• Have a cell membrane & cell wall
• Contain ribosomes to make proteins in their cytoplasm
Eukaryotic Cell
Contain 3 basic cell structures:
Nucleus (containing DNA)
Cell Membrane Cytoplasm with
organelles
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Organelles
Called the “organs” of cells
Very small in size
Have specific functions
Found in cytoplasm of cell
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Smooth & Rough Endoplasmic Reticulum
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• Smooth ER - lacks ribosomes & detoxifies poisons and synthesizes lipids
• Rough ER - has ribosomes on its surface & makes proteins to EXPORT
Mitochondria
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• Site of Cellular respiration – the capturing of energy from food
• Breaks down glucose to produce energy ATP
Animal Cell Organelles
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glycogen granule
• Glycogen is stored in the cytoplasm of animal cells for food energy
What are the basic parts of all eukaryotic cells?
Have a cell membrane surrounding the cytoplasm
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Have membrane-bound organelles
Have a nucleus
Differences between plant cells and animal cells
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Animal cells Plant cells
Relatively small in size
Irregular shape
No cell wall
Relatively large in size
Regular shape
Cell wall present