definition of life order: cellular structure crystals have structure without life
TRANSCRIPT
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Definition of lifeOrder: cellular structure
Crystals have structure without life
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reproduction
Growth & development
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Energy utilization
Response to the environment
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Evolution
Darwin
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Adaptation
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Darwinian theory of evolutionOver production
Individual variations
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Natural selection
75% of population perished in one storm
predators prey
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Artificial selection
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Composition of cells
Organic molecules:Carbon is a versatile chemical element
Water & oxygen
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Difficulties with other elements
Weak bonds
No double bonds
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Molecular components Carbohydrates: 2H/O sugar, starch, cellelus. glucos C6H12O6
Lipids: fatty acidStore energy for cells
Proteins: large molecules
Nucleic acids: DNA (deoxyribonucleic acid) & RNA (ribonucleic acid)Store structural information
Built on amino acids. Enzymes & catalystsRegulate reaction ratesBuild structures
Provide energy to cellsfibers
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Two basic cell typesProkaryotic cells: No distinct nucleusSingle cell species eg E coli or Salmonelia
Eukaryotic cells: Both single cell (amkebas) complex species (plants, animals)
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Biological tree of life: five kingdomsBased on cell structures
Drawin’s notes
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RNA tree of life: three domainsBased on molecular structure
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The chemistry of life
Metabolism: chemistry of life regulates reaction rates
Atp(adenosine triphosphate)
Metastable reaction
+H2O
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Carbon and energy
Heterotroph: get carbon fromother organic compounds Autotroph: get carbon directly from the atmosphere
Photosynthesis: sun light provides a source of energy, CO2
Chemoheterotroph: organic molecules
Chemoautotroph: inorganic chemicals, eg sulfur, iron, amonia. CO2
Carbon is the most common raw material
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Importance of water1) Dissolving organic molecules
2) transportation
3) ATP chemistry
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Double helix of DNA molecules
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Gene’s analysis
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DNA replication
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Genetic code
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Virus (a strand of RNA, not alive)Coronavirus: common cold, SARS
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Mutation and evolution
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extremofilesThermofiles