1.1 Cell Theory Flashcards
Cell Theory States That…
All living things are composed of cells
Cell is the smallest unit of life
Cella arise from pre- existing cells
Exceptions to the theory
Striated muscle cells
Giant Algea
Red Blood cell
Aseptate hyphae
Why are striated muscle cells exceptions
Composed of fused cells. Multi-nucleated
Why are Giant algae exceptions
Unicellular organisms. Very large (7cm)
Why are Aseptate hypae exceptions
Lack partioning. Continuous cytoplasm
Why are red blood cells exceptions
Lack nucleus
Functions of life
Metabolism
Response
Sensitivity
Homeostasis
Excretion
Nutrition
Growth
Surface area to volume ratio
Important in the limitation of cell size
Rate of metabolism
Function of volume
Rate of material exchange
Function of cell’s surface area
As a cell grows…
Volume increases faster than surface area
Cells would die if…
metabolic requirements exceed material
2 types of microscopes
Light and electron
Features of Light microscopes
View LIVING specimens in NATURAL color
Lower magnification and resolution
Features of electron microscope
Only view DEAD specimens in monochrome
Higher magnification and resolution
Show surface rendering
