The Cell The cell is the smallest unit of life that can carry out life processes.
Cells and Cell Structures. “Cell” Name means “small room” Basic structural, functional and...
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Transcript of Cells and Cell Structures. “Cell” Name means “small room” Basic structural, functional and...
Cells and Cell Structures
“Cell”• Name means “small room”• Basic structural, functional
and biological unit of all KNOWN living organisms
• Smallest unit of life that can replicate independently
Microscopes were used as early as the 1600s to look at things.
• 1665 Hooke used a microscope to look at the bark of a Cork-bark oak
• Saw this and named them ‘cells’
• Snowflake
• 1838: Schleiden concluded all plants are made of cells
• 1839: Schwann stated all animals were made of cells
• 1855: Virchow concluded new cells can only be produced from existing cells
Spurred more interest… better technology
Cell Theory• All living things are made of
cells• Cells are the basic structural
and functional unit of living things
• New cells are produced from existing cells
Cell Theory• What IS a theory?• Why is it “Cell Theory” and not “Cell Law”?• Do we know about “ALL living things”?
• Two (broad) categories of cells
• NO membrane-bound organelles = Prokaryotes
• HAS membrane-bound organelles = Eukaryote
Prokaryotes and Eukaryotes
Scanning electron micrograph of E. coli in human intestine
www.listoid.com
Scanning electron micrograph of human brain neuron
www.scienceclarified.com
• Smaller and ‘simpler’
• Bacteria are prokaryotes
• MOST living things are prokaryotes
Prokaryotes
Prokaryotes
• Smaller and ‘simpler’
• Bacteria are prokaryotes
• MOST living things are prokaryotes
• MOST of ‘you’ is prokaryotic
• YOU are outnumbered 10:1 in/on YOU!!!!
Prokaryotes
American Society for Microbiology, June 5, 2008
Scale between human cells and bacterial cell
• Larger, more ‘complex’
• Eukaryotes have a nucleus
• MOST have other organelles
• Protists to animal/plant cells
Eukaryotes
Daphnia are NOT protists. They’re related to lobsters- Crustaceans
• Review your notes!!!!!!!!!!!!!!!
Homework