Unit 1: Cell Theory & Characteristics of Life
The evolution of multicellular organisms allowed for cell specialization and cell replacement.
There is a difference between living and non-living. How are we able to know the difference?
Cell theory is a “theory”. What is a theory in science? How much evidence is required to support a theory and what sort of counter evidence is required to refute it?
Organisms consisting of only one cell carry out all functions of life in that cell.
Investigation of functions of life in Paramecium and one named photosynthetic unicellular organism.
According to the cell theory, living organisms are composed of cells.
Looking for trends and discrepancies: although most organisms conform to cell theory, there are exceptions.
Questioning the cell theory using atypical examples, including striated muscle, giant algae and aspetate fungal hyphae.
Cells can only be formed by division of preexisting cells.
Testing the general principles that underline the natural world - the principles the cells only come from preexisting cells needs to be verified.
Evidence from Pasteur’s experiments that spontaneous generation of cells and organisms does not now occur on Earth.
The first cells must have arisen from nonliving material.
Published Definitions of Life
Characteristics of Life Notes
Characteristics of Life (video)
NASA's Working Definition of Life Reading
The Meaning of Life Article
What is Life? Article
Unicellular Organisms Notes
Paramecium Virtual Lab
Cell Theory Notes
Simulating a Living Cell Reading
Simple Cell Reading
Exceptions to the Cell Theory Notes
Cells Come from Pre-Existing Cells Notes
Spontaneous Generation Notes (Notes were Emailed)
Origins of Life Notes (Notes were Emailed)
Origin of Life on Earth Article
Final Knowledge Inventory