cell evolution

organic molecules

contain carbon

inorganic molecules

usually don’t contain carbon

radiant energy

physical energy resulting from electromagnetic radiation — flow of energy through space

organic molecules are the

building blocks of the macromolecules of living organisms

cell theory

1) all living organisms are composed of one or more cells

2) the cell is the basic unit of structure and organization in organisms

3) cells arise from preexisting cells

advantages of being small

1) efficiently enter cell

2) efficiently diffuse

— cell must transform energy from environment into stored energy

prokaryotic cells

surface area to volume ratio of 3:1

eukaryotic cells

surface area to volume ratio of 0.3:1

both procaryotic and eukaryotic cells have

macromolecules

plasma membrane

cytoplasm

DNA and RNA

ribosomes