BIOL 1202 : Exam 1
Document Summary
Get more food: 2 billion years ago- no eukaryotic cells, planet is 4. 6 billion years old (be able to recognize in long form, life appeared on planet about 4 billion years ago. Broth in flask is boiled to kill preexisting microorganisms: 2. As broth cools, condensing water collects, sealing mouth of flask: this is observation, put forth hypothesis that solution was sterile and would not produce life unless life entered solution from outside, would not spontaneously generate life, 3. Conclusion- earliest cells used rna to store info: 2. Ribozymes to catalyze reactions: microspheres as proto-cells. Eukarya (primary difference is how they get nutrition) All living things on the planet share some dna sequence; all living things are related. 2 copies of each gene because they are diploid: 100 people 200 versions of allele, difference in dna sequence does not always affect phenotype, genetic composition of population changes (evolve, differential survival and reproduction (natural selection)
