Transcript What is Life?
What is Life? ASTR 4: Life in the Universe Discussion Topics • • • • Three Domains of Life Basic Cell Structure Macro-molecules Properties of Life Three Domains of Life Basic Cell Structure Basic Prokaryotic Cell Structure Basic Eukaryotic Cell Structure Macro-molecules • • • • Proteins Nucleic Acids Carbohydrates Lipids Proteins Proteins Proteins Proteins Nucleic Acids Nucleic Acids Nucleic Acids Carbohydrates (C:H:O=1:2:1) Lipids Chirality Properties of Life • • • • • • • Order Metabolism (Energy Utilization) Reproduction (Growth) Differentiation (Development) Communication Movement (Response to the Environment) Evolution More Questions… • How about Viruses, Viroids & Prions? • Carbon-based Only? • Closed System Only? • What is the minimal definition of life? Human Coronavirus -SARS Prion – Mad Cow Disease