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What is Life?
ASTR 4: Life in the Universe
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Discussion Topics
• Three Domains of Life
• Basic Cell Structure
• Macro-molecules
• Properties of Life
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Three Domains of Life
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Basic Cell Structure
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Basic Prokaryotic Cell Structure
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Basic Eukaryotic Cell Structure
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Macro-molecules
• Proteins• Nucleic Acids• Carbohydrates• Lipids
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Proteins
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Proteins
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Proteins
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Proteins
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Nucleic Acids
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Nucleic Acids
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Nucleic Acids
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Carbohydrates (C:H:O=1:2:1)
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Lipids
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Chirality
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Properties of Life
• Order
• Metabolism (Energy Utilization)
• Reproduction (Growth)
• Differentiation (Development)
• Communication
• Movement (Response to the Environment)
• Evolution
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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