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Domains of Life an Cellular Diversity (Characteristics of life (Response,…
Domains of Life an Cellular Diversity
Cell Theory
All living organisms are composed of cells
Cells are the basic building blocks of life
All cells come from pre-existing cells
Organism
An individual form of life
Single-celled organism = Unicellular
Organism made up of many cells = Multi cellular organism
Characteristics of life
Response
Reproduction
Growth and development
Regulation
Homeostasis
Energy processing
Order - organisation and structure
Three basic cell types on earth
Eukaryotes
Bacteria
Archaea
Single lipid layer membrane and membranes do not contain the same lipids that other organisms do - they have Isoprene chains
Isoprene chain = glycerol linked to a hydrocarbon chain by esther linkages
Cell wall not made of peptidoglycan. Most have S layer - protein subunits.
Like Bacteria - Archaea have 70s ribosomes but a different shape
They have more complex RNA polymerases than Bacteria
Lack membrane bound organelles
Lack Nucleus
Bacteria and achaea are Prokaryotes
Prokaryotes
Lack of membrane- bound organelles
Presence of a single, circular chromosome
Tree of life = A visual representation of the suggestion evolutionary history of organisms classified using particular characteristics
Phylogeny = Evolutionary relationship of organisms through time