Conversations with the Earth Tom Burbine [e-mail]

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Conversations with the EarthTom
Burbinetburbine_at_framingham.edu
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Quiz on Thursday

• Forming life on Earth

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• http//video.google.com/videoplay?docid-587873335
  6144169008

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Basic Definition of Life

• Growth
• Metabolism
• Motion
• Reproduction
• Stimulus response

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• organic compound - one or more atoms of carbon
  are covalently linked to atoms of other elements,
  most commonly hydrogen, oxygen, or nitrogen.

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• Amino acids building blocks of proteins

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Essential cant be synthesized by
humans Nonessential - can be synthesized by
humans
Essential Nonessential
Isoleucine Alanine
Leucine Arginine
Lysine Aspartate
Methionine Cysteine
Phenylalanine Glutamate
Threonine Glutamine
Tryptophan Glycine
Valine Proline
Histidine Serine
Tyrosine Asparagine
Selenocysteine Pyrrolysine
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• polypeptide - single linear chain of amino acids
• proteins chains of amino acids

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• Three major macromolecules are essential for all
  known forms of life.
• Proteins
• Nucleic acids carry genetic information
• RNA Ribonucleic acid
• DNA - Deoxyribonucleic acid

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Oparin-Haldane Hypothesis (1920s)

• Aleksandr Oparin and John Haldane independently
  came up with the idea that life could have
  originated from chemical reactions in a
  hydrogen-rich atmosphere

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• If the early atmosphere was rich in
  hydrogen-containing gases such as methane (CH4)
  and ammonia (NH3), sunlight or lightning could
  cause organic compounds to form

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Miller-Urey experiment (1952)

• Tested whether organic compounds could be
  produced from inorganic precursors

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• Experiment formed organic compounds
• Experiment formed amino acids

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• http//academicearth.org/lectures/dna-introduction
  

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• human and mouse genomes have some 3 billion DNA
  base pairs

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• RNA transfers genetic information and makes
  proteins and other compounds
• DNA stores genetic information

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DNA
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DNA

• James Watson and Francis Crick
  discovered that DNA had a double
  helix structure
• DNA contains the genetic information that allows
  all modern living things to function,
  grow and reproduce.

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• http//www.youtube.com/watch?vsf0YXnAFBs8

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Any Questions?