AP Biology · Unit 7: Natural Selection
7.12 Origins of Life on Earth
In short
You are expected to know the specific timeline of early Earth (formation at 4.6 bya, hostile environment until 3.9 bya, earliest fossil evidence at 3.5 bya) as geological evidence supporting models of the origin of life.
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What else do you need to know about Origins of Life on Earth?
You must also understand the RNA world hypothesis and its three specific assumptions: that RNA replication assured genetic continuity, that base-pairing is necessary for this replication, and that genetically encoded proteins were not involved as catalysts. The specification does not require memorization of specific early Earth atmospheric compositions or detailed steps of abiogenesis beyond the RNA world hypothesis.
Can you do these?
- I can explain the geological timeline of early Earth and how it provides a plausible range of dates for the origin of life.
- I can describe the RNA world hypothesis and list its three key assumptions regarding early genetic material.
How is Origins of Life on Earth tested on the exam?
The primary command word for this topic is 'Describe'. The suggested skill is 'Questions and Methods' (3.B), specifically 'State the null hypothesis or predict the results of an experiment.' This indicates that you may be assessed on your ability to apply their knowledge of the origin of life and the RNA world hypothesis to experimental scenarios, predicting outcomes or formulating hypotheses based on the provided scientific evidence.
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Origins of Life on Earth: common questions
What do you need to know about Origins of Life on Earth for AP Biology?
You are expected to know the specific timeline of early Earth (formation at 4.6 bya, hostile environment until 3.9 bya, earliest fossil evidence at 3.5 bya) as geological evidence supporting models of the origin of life.
How is Origins of Life on Earth tested on the AP Biology exam?
The primary command word for this topic is 'Describe'.
How do I know I have mastered Origins of Life on Earth?
Check you can do each of these: explain the geological timeline of early Earth and how it provides a plausible range of dates for the origin of life; describe the RNA world hypothesis and list its three key assumptions regarding early genetic material.
Where does Origins of Life on Earth fit in AP Biology?
Origins of Life on Earth is topic 7.12 in Unit 7: Natural Selection of AP Biology.
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