A RNA molecule that can act as a catalyst and promote a specific chemical reaction

A related group of unicellular organisms, many of which thrive under harsh environments

Carbon Dioxide serves as a carbon source for the assembly of organic molecules

A group of photosynthetic, unicellular prokaryotes

The upper-layer of the atmosphere

Theory that a small aerobic prokaryote was engulfed by and began to live and reproduce inside of a larger, anaerobic prokaryote

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Chapter 14

Section 3: The First-Life Forms

Term	Definition
Ribozyme	A RNA molecule that can act as a catalyst and promote a specific chemical reaction
Archaea	A related group of unicellular organisms, many of which thrive under harsh environments
Chemosynthesis	Carbon Dioxide serves as a carbon source for the assembly of organic molecules
Cyanobacteria	A group of photosynthetic, unicellular prokaryotes
Ozone	The upper-layer of the atmosphere
Endosymbiosis	Theory that a small aerobic prokaryote was engulfed by and began to live and reproduce inside of a larger, anaerobic prokaryote