* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Earth`s Early History 10-2
Epigenetics of human development wikipedia , lookup
Short interspersed nuclear elements (SINEs) wikipedia , lookup
Genetic code wikipedia , lookup
Messenger RNA wikipedia , lookup
RNA interference wikipedia , lookup
Vectors in gene therapy wikipedia , lookup
Polycomb Group Proteins and Cancer wikipedia , lookup
Nucleic acid analogue wikipedia , lookup
Deoxyribozyme wikipedia , lookup
Polyadenylation wikipedia , lookup
Mir-92 microRNA precursor family wikipedia , lookup
Nucleic acid tertiary structure wikipedia , lookup
RNA silencing wikipedia , lookup
Epitranscriptome wikipedia , lookup
Non-coding RNA wikipedia , lookup
History of RNA biology wikipedia , lookup
Primary transcript wikipedia , lookup
Welcome to Class! 10-2 Complete the following: New entry “Early Earth History” Review of Biochemistry TEST (spoon) Homefun: Study for your test is on Monday Oct 5 and Tuesday Oct 6 Earth’s Early History Learning Objectives Identify some of the hypotheses about early Earth and the origin of life. Discuss the hypothesis that explains the origin of eukaryotic cells. The Mysteries of Life’s Origins The Miller–Urey Experiment 2 A mixture of methane, ammonia, and hydrogen is added to the water vapor. 1 Water is heated, and water vapor forms. 3 The circulating gases are bombarded by sparks of electricity. 4 Cold water cools the chambers, causing droplets to form. 5 After a week, liquid is collected, which contains amino acids and other organic compounds. RNA First? Inorganic matter Simple organic molecules RNA nucleotides DNA functions in information storage and retrieval. RNA is able to replicate itself, synthesize proteins, and function in information storage. RNA helps in protein synthesis. Proteins build cell structures and catalyze chemical reactions. Life Changes the Atmosphere Origin of Eukaryotic Cells Ancient photosynthetic bacteria Ancient aerobic bacteria Nuclear envelope forming Plants and photosynthetic unicellular eukaryotes Primitive photosynthetic eukaryote Ancient anaerobic prokaryote Mitochondrion Primitive aerobic eukaryote Animals, fungi, and nonphotosynthetic unicellular eukaryotes Complexity in Eukaryotes Eukaryotic Structures Krebs cycle Ribosomes Cilia and flagella Nearly all key enzymes in the Krebs cycle were borrowed from other pathways in the cell. The earliest cells may have produced proteins using RNA alone. This RNA became the ribosome; proteins were added to improve efficiency. Flagella are assembled from protein subunits that serve other purposes elsewhere in the cell.