Conversations with the Earth Tom Burbine

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Presentation transcript:

Conversations with the Earth Tom Burbine

Quiz on Thursday Forming life on Earth

# #

Basic Definition of Life Growth Metabolism Motion Reproduction Stimulus response

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

Amino acids – building blocks of proteins

EssentialNonessential IsoleucineAlanine LeucineArginine LysineAspartate MethionineCysteine PhenylalanineGlutamate ThreonineGlutamine TryptophanGlycine ValineProline HistidineSerine TyrosineAsparagine SelenocysteinePyrrolysine Essential – can’t be synthesized by humans Nonessential - can be synthesized by humans

polypeptide - single linear chain of amino acids proteins –chains of amino acids

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

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

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

Miller-Urey experiment (1952) Tested whether organic compounds could be produced from inorganic precursors

Experiment formed organic compounds Experiment formed amino acids

human and mouse genomes have some 3 billion DNA base pairs

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

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.

Any Questions?