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BIS 2C study guide B&A

BIS 2C study guide B&A - Number of origins of life...

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Number of origins of life and how many trees of life are there? - There is supposedly one tree of life because all organisms have a universal homologies. Universal homologies - Examples: A. Molecular and cellular featurs Use DNA as a genetic material Use ACTG in DNA Use ACUG in RNA Three letter genetic code Central dogma (DNA to RNA to protein) Lipoprotein cell envelop 20 core amino acids in protein B. Specific complex and genes Ribosome and protein and RNA RNA polymerase protein - What they mean for the tree of life. All organisms derived from one root (LUCA) - Why these cannot be used to infer branching patterns The phenotype of all organisms has change a lots since the beginning of life. The only factual evidences are genetic sequences. rRNA and the tree of life - How a universal gene can be used to infer phylogeny. Since all living being have their unique genetic sequence, it can be used to infer phylogeny. - Three domain tree of life Bacteria, Archaea, Eurkaryote - Rooted tree of life - Differences and similarities between each of the major domains
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