BIOL 1102 Lecture Notes - Lecture 4: Cyanobacteria, Flagellum, Hydrophile

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The oldest fossils are 3. 5 billion years old. What living organisms are these fossils most like: most like modern cyanobacteria. What are the properties of life: capacity for metabolism. Metabolism: controlled chemical reactions that acquire and use energy: controlled responses to the environment, growth, self-reproduction. Three structural features that all cells share: plasma or cell membrane. The main component of the cell membrane: phospholipids. Describe the phospholipids: 1 hydrophilic head with two hydrophobic tails. Describe the cell membrane: makes the cell membrane water proof: dna, rna, and ribosomes. Rna and ribosomes: the molecules that read dna and make the molecules: cytoplasm: the water based fluid inside the cell. Three domains of life (three major types of cells: first two domains (prokaryotes): archaea, bacteria. Have a cell wall and a cell membrane. Two groups: gram stained negative and positive: third domain (eukaryotes): plants, animals, fungi, protists. Formed from an endosymbiosis (one cell living inside another)

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