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Origins of Life
EXAM 3 Origins of Life
| Question | Answer |
|---|---|
| Chemical evolution proposes that there was an early atmosphere and that it was a _______ atmosphere | reducing |
| Chemical evolution suggested that __, __, __, and __ would be present, but there would be no ___ | N2, H2, CO2, and H20; O2 |
| O2 tends to _____ molecules | destroy |
| we have _____ atmosphere | an oxidizing |
| Miller’s experiment does not account for ______ of molecules | chirality (handedness) |
| Chirality is the ability of two isomers to... | be mirror images of each other |
| _____ amino acids are toxic | "Right-handed" |
| If these “protocells” occurred they would probably have to be _____, meaning that they couldn’t make their own ______ through photosynthesis | heterotrophic; food |
| They would have to live on the _____ that is suppose to have existed | “organic soup” |
| Structures that are proposed to have been passed on from a common ancestor because they are similar in structure; Or is this evidence of variations on a common design | Homologous structures |
| structures are similar in function, but structurally unrelated | Analogous structures (ex: bird and insect wings) |
| _____ is the process by which populations become adapted to their environment | Natural Selection |
| a change in the gene frequencies within a population over time | Microevolution (Is not Darwinian evolution) |
| Examples of microevolution: | Insect resistance to pesticides (Colorado Potato Beetle); different breeds of dogs |
| 2 Evolutionary Models: | Phylogenetic gradualism and punctuated equilibrium |
| Phylogenetic gradualism | New organisms were produced through slow, moderate changes, but it was a steady process (– There are no transition links because the change was too gradual to be noticed) |
| Punctuated equilibrium | Speciation occurs rapidly followed by long periods of no change |
| (Punctuated equilibrium) | new trait occurs in a small isolated group on the periphery of an ancestral population; disaster occurs in an area, only a few survive and they have the new trait-reproduce and the new trait becomes dominant in the population; Based on a lack of evidence |
| Darwin's Black Box | A computer looks simple on the outside but once you tear it apart, it's complex |
Created by:
chelsea_2010
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