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Bio 105 Chapter 18 Quiz

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Stages of the Origin of Life

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Terms in this set (15)

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