Detection of Extrasolar Planets ASTR 4: Life in the Universe.
What is Life? ASTR 4: Life in the Universe. Discussion Topics Three Domains of Life Basic Cell...
-
Upload
gordon-little -
Category
Documents
-
view
224 -
download
0
Transcript of What is Life? ASTR 4: Life in the Universe. Discussion Topics Three Domains of Life Basic Cell...
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