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Cell Theory - Coggle Diagram
Cell Theory
Cells carry out all functions necessary for life
Growth: An irreversible increase in size.
Homeostasis: Keeping conditions inside the organisms within tolerable limits.
Metabolism: Chemical reactions inside the cell, including cell respiration, to release energy.
Nutrition: Obtaining food, to provide energy and the materials needed for growth.
Reproduction: Producing offspring either sexually or asexually.
Sensitivity: Perceiving and responding to changes in the environment.
What is the cell theory?
All living things are made of one or more cells.
The cell is the smallest unit of life.
All cells come from pre-existing cells.
All cells come from pre-existing cells:
Does this imply that life always existed?
Contradicts with geological science.
Exception made for the origin of life, when cells arose from non-living substances.
The cell is the smallest unit of life.
Nothing smaller than a cell can survive independently.
The lower limit on cell size is about 200nm, large enough for DNA, ribosomes, and membranes.
Prokaryotes
Cells that do not have membrane bound organelles.
All living things are made of one or more cells.
Microscopes allow us to observe that all living things are either unicellular or multicellular.
Eukaryotes
Cells that contain membrane bound organelles.