BIOL 1202 : Exam 1
Document Summary
Difference between theory and hypothesis: hypothesis an idea or an assumption, theory a hypothesis that has been tested many times. History of life on earth: how did life begin, nobody knows, several hypothesis on how this happened, few centuries ago. People thought that new living things appeared all the time by spontaneous generation: mid 1800"s. Louis pasteur: proved the previous theory was completely wrong, boiled brother to kill preexisting microorganisms. As broth cools, condensing water collects, sealing the mouth of the flask. Earth is the only place we know life was spontaneously generated. How to assemble a living thing: accumulation of organic molecules, catalyze reactions, enzymes (proteins) and some rnas, reproduce from stored genetic info, stored info in dna, separate the living thing from the outside environment. Organic molecules like rna, carbohydrates, proteins, lipids: first prokaryotes. Family tree of life: 3 domainds, eukarya, archae, bacteria.
