aim: how did life begin ?
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Aim: How did life begin ?. HW #5 Read pages 423-428 Pg. 428 section 17-2 answer Q 1-4. Billions of years ago, life on Earth is thought by many scientists to have begun as simple, single organisms. About a billion years ago, increasingly complex multi-cellular organisms began to evolve. - PowerPoint PPT PresentationTRANSCRIPT
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Aim: How did life begin ?
HW #5Read pages 423-428Pg. 428 section 17-2 answer Q 1-4
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• Billions of years ago, life on Earth is thought by many scientists to
have begun as simple, single organisms. About a billion years ago, increasingly complex multi-
cellular organisms began to evolve.
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Do Now:KWL(What is Life ?)
K W L
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Conditions of Primitive Earth
H2 He CH4 NH3
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Evolution of the Present Atmosphere
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The heterotroph hypothesis describes the possible change of the earth’s atmosphere to
support life, as we know it.
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Organic compounds are compounds found in living things.
They contain carbon, Hydrogen and Oxygen
• Nucleic acids• Carbohydrates• Proteins• Lipids
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Stanley Miller's (and subsequent) experiments have not proven life originated in this way, only that conditions thought to have existed over 3 billion years ago were such that the spontaneous (inorganic) formation of organic macromolecules could have taken place.
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KWL
• Go back and fill in the L column
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Aim: How do we define Life ?
• What do living things do that non-living things cannot do?
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Life Functions
• Digestion - breakdown of food to simpler molecules which can enter the cells
Circulation - the movement of materials within an organism or its cells
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Life Functions
• Movement - (locomotion) change in position by a living thing
• Excretion - removal of waste products by an organism (wastes may include carbon dioxide, water, and urea in urine and sweat)
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Life Functions
• Respiration - process which converts the energy in food to ATP (the form of energy which can be used by the cells)
• Reproduction - the making of more organisms of one's own kind -- not needed by an individual living thing but is needed by its species
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Life Functions
Regulation - the control of the various activities of an organism (mostly involves the nervous system and endocrine glands in complex animals)
Synthesis - the production of more complex substances by combining two or more simpler substances
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All living things perform life functions from the smallest organism to the largest
Uni-cellular protozoanWhale Shark
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Digestion
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Circulation and Movement
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Excretion
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Respiration
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Reproduction
Paramecium Conjugation Marsupial birth
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Regulation
Phototropism in plant shoots
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Synthesis
All cells synthesize compounds for use in and out of the cell