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Bio 105 Chapter 18 Quiz
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Stages of the Origin of Life
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Stage 1. Organic monomers; Stage 2. Organic polymers; Stage 3. Protocells; Stage 4. Living cells
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Stages of the Origin of Life
Stage 1. Organic monomers; Stage 2. Organic polymers; Stage 3. Protocells; Stage 4. Living cells
Stage 1. Organic monomers
Simple organic molecules, called monomers, evolved from inorganic compounds before the existence of the first cells. Amino acids, the basis of proteins, and nucleotides, the building blocks of DNA and RNA, are examples of organic monomers.
Stage 2. Organic polymers
Organic monomers were joined, or polymerized, to form organic polymers, such as DNA, RNA, and proteins.
Stage 3. Protocells
Organic polymers became enclosed in a membrane to form precursors to the first cells, called protocells or protobionts
Stage 4. Living cells
Protobionts acquired the ability to self-replicate, as well as other cellular properties