A tour of the cell
Cell theory
• All organisms are composed of cells
• Cells are the smallest living things
• Cells arise only from other cells
• They are only pre-existing
All cells today represent a continuous line
of descent from the first living cells.
Cell size
• cell size is limited
• As cell size increases, it takes
longer for material to diffuse
from the cell membrane to the
interior of the cell.
• Surface area to volume ratio
• As a cell increases in size, the
volume increases 10 times faster
than the surface area!
cells volume
increases 10
times faster
than the surface
a rea
, Plant Animal
All cells have: Both animal
• Cytoplasm
and plant
• A plasma membrane
• Genetic material cells are
• Ribosomes included in
• These make proteins this statement
Prokaryotic Cells
• Almost all prokaryotic cells lack membrane
bound nuclei
• Their genetic material is present in
the nucleoid region, instead
• Two types of prokaryotic cells Eukaryotes
• Archaea prokaryotes
• Bacteria
Cell theory
• All organisms are composed of cells
• Cells are the smallest living things
• Cells arise only from other cells
• They are only pre-existing
All cells today represent a continuous line
of descent from the first living cells.
Cell size
• cell size is limited
• As cell size increases, it takes
longer for material to diffuse
from the cell membrane to the
interior of the cell.
• Surface area to volume ratio
• As a cell increases in size, the
volume increases 10 times faster
than the surface area!
cells volume
increases 10
times faster
than the surface
a rea
, Plant Animal
All cells have: Both animal
• Cytoplasm
and plant
• A plasma membrane
• Genetic material cells are
• Ribosomes included in
• These make proteins this statement
Prokaryotic Cells
• Almost all prokaryotic cells lack membrane
bound nuclei
• Their genetic material is present in
the nucleoid region, instead
• Two types of prokaryotic cells Eukaryotes
• Archaea prokaryotes
• Bacteria
