Term
| How old is Earth estimated to be? |
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Definition
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Term
| What is nebula and what is the nebula hypothesis? |
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Definition
| A nebula is a cloud of gas and dust in space. The nebula hypothesis says that gravity pulled much material together forming the sun and the remaining material formed the planets (and Pluto). |
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Term
| What kinds of gases did Earth's early atmosphere contain? |
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Definition
| Ammonia, water vapor, methane, and carbon monoxide. |
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Term
| What was the climate like on early Earth? |
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Definition
| Very hot. This was due to extreme volcanic activity. |
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Term
| How were the oceans formed? |
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Definition
| When the earth cooled the water vapor condensed into the oceans. |
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Term
| What hypothesis about where organic molecules came from did Miller and Urey's experiment support? |
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Definition
| It supported the hypothesis that energy from lightning created organic materials from inorganic ingredients. |
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Term
| What was the meteorite hypothesis? |
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Definition
| It hypothesized that amino acids came from meteors that landed on Earth. |
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Term
| What cell organelle were liposomes hypothesized to be? |
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Definition
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Term
| What is thought to be the early genetic material? |
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Definition
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Term
| What is different about the way DNA replicates and the way RNA in the form of a ribozyme replicates? |
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Definition
| RNA in the form of a ribozyme can catalyze its own replication, while DNA needs DNA polymerase and other enzymes. |
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Term
| How do scientists think eukaryotic cells evolved from prokaryotes? |
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Definition
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