| key concept4.1Nucleic Acid Structures Reflect Their Functions
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| Nucleic acids are informational macromolecules
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| Base pairing occurs in both DNA and RNA
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| DNA carries information and is expressed through RNA
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| The DNA base sequence reveals evolutionary relationships
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| Nucleotides have other important roles
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| key concept4.2The Small Molecules of Life Originated on Primitive Earth
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| Living organisms do not repeatedly come from inanimate nature
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| Prebiotic synthesis experiments model early Earth
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| Life may have come from outside Earth
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| key concept4.3The Large Molecules of Life Originated from Small Molecules
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| Complex molecules could be formed from simpler ones on primitive Earth
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| RNA may have been the first biological catalyst
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| key concept4.4Cells Originated from Their Molecular Building Blocks
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| How did the first cells with membranes come into existence?
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| Some ancient cells left a fossil imprint
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| Apply What Youâve Learned
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