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Fig. 25-7

Ceno- zoic. Meso- zoic. Humans. Paleozoic. Colonization of land. Animals. Origin of solar system and Earth. Fig. 25-7. 4. 1. Proterozoic. Archaean. Prokaryotes. years ago. Billions of. 3. 2. Multicellular eukaryotes. Single-celled eukaryotes. Atmospheric oxygen.

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Fig. 25-7

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  1. Ceno- zoic Meso- zoic Humans Paleozoic Colonization of land Animals Origin of solar system and Earth Fig. 25-7 4 1 Proterozoic Archaean Prokaryotes years ago Billions of 3 2 Multicellular eukaryotes Single-celled eukaryotes Atmospheric oxygen

  2. Fig. 25-2

  3. CH4 Water vapor Electrode NH3 H2 LE 26-2 Condenser Cold water Cooled water containing organic molecules H2O Sample for chemical analysis

  4. 20 µm Glucose-phosphate Fig. 25-3 Glucose-phosphate Phosphatase Starch Amylase Phosphate Maltose (a) Simple reproduction by liposomes Maltose (b) Simple metabolism

  5. Ribozyme (RNA molecule) 3¢ Template LE 26-5 3¢ Nucleotides Complementary RNA copy 5¢ 5¢

  6. RNA transcript (pre-mRNA) 5¢ Intron Exon 1 Exon 2 Protein Other proteins snRNA snRNPs Spliceosome Modern evidence of early RNA dominance - RNA world LE 17-11-1

  7. Spliceosome 5¢ LE 17-11-2 Spliceosome components Cut-out intron mRNA 5¢ Exon 2 Exon 1

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