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15 Cards in this Set
- Front
- Back
The "reproduction of pre-existing life is called what? |
Biogenesis |
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The four-stage hypothesis for the origin of life **Essay Question |
Stage 1: Abiotic Synthesis of Organic Monomers Stage 2: Abiotic Synthesis of Polymers Stage 3: Formation of Pre-Cells Stage 4: Origin of Self-Replicating Molecules |
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Prokaryotes |
--Are found wherever there is life --Have a collective biomass that is at least 10 times that of all eukaryotes. --thrive in habitates too cold, too hot, too salty, too acidic, or too alkaline for any eukaryote. --Cause about half of all human diseases --Are more commonly benign or beneficial |
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Compared to eukaryotes, prokaryotes are... |
--Much more abundant --Typically much smaller |
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The three most common shapes of prokaryotes are what? |
1) Spherical (cocci) 2) Rod-shaped (bacilli) 3) Spiral or curved |
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Some prokaryotes form endospores. Endospores are what? |
--Thick-coated, protective cells. --Produced when the prokaryote is exposed to unfavorable conditions. |
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Pathogens are what? |
Bacteria and other organisms that cause disease |
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Bioremediation is... |
--The use of organisms to remove pollutants from water, air, and soil. |
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Protists are... |
--Eukaryotes that are not fungi, animals, or plants. --Mostly unicellular --Ancestral to all other eukaryotes |
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Eukaryotic cells evolved by |
--the infolding of the plasma membrane of a prokaryotic cell (to form the endomembrane system.) --A process known as endosymbiosis |
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Endosymbiosis (2 things) |
--Refers to one species living inside another host species. --Is the process by which eukaryotes gained mitochondria and chloroplasts. |
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Protozoans are... |
Protists that live primarily by ingesting food |
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Algae are... |
--Photosynthic protists whose chloroplasts support freshwater and marine ecosystems |
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Seaweeds (5 things) |
--Are large, multicellular marine algae --Grow on or near rocky shores --Are only similar to plants because of convergent evolution --Are most closely related to unicellular algae --Are often edible |
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The three groups of seaweeds are... |
--Red algae --Green algae --Brown algae |