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Questions and Answers
What was the source of energy for chemo-autotrophs?
What was the source of energy for chemo-autotrophs?
- Light energy
- Chemical reactions (correct)
- Organic molecules
- Aerobic respiration
What type of organisms were the first forms of life?
What type of organisms were the first forms of life?
- Heterotrophic eukaryotes
- Autotrophic prokaryotes
- Heterotrophic prokaryotes (correct)
- Autotrophic eukaryotes
What was the primary reason for the evolution of aerobic respiration?
What was the primary reason for the evolution of aerobic respiration?
- The depletion of organic molecules in the seas
- The evolution of autotrophs
- The production of oxygen through photosynthesis (correct)
- The emergence of animals
What led to the evolution of autotrophs?
What led to the evolution of autotrophs?
Which of the following is not one of the three distinct lines of evolution that prokaryotes gave rise to?
Which of the following is not one of the three distinct lines of evolution that prokaryotes gave rise to?
Which of the following is not a distinct line of evolution that prokaryotes gave rise to?
Which of the following is not a distinct line of evolution that prokaryotes gave rise to?
What was the role of cyanobacteria in the evolution of autotrophs?
What was the role of cyanobacteria in the evolution of autotrophs?
What was the role of photosynthesis in the evolution of aerobic respiration?
What was the role of photosynthesis in the evolution of aerobic respiration?
What is the age range of rocks where only bacteria have been found?
What is the age range of rocks where only bacteria have been found?
Which autotrophs were among the earliest and used phycocyanin to capture light energy?
Which autotrophs were among the earliest and used phycocyanin to capture light energy?
When did eukaryotes become numerous?
When did eukaryotes become numerous?
What type of organisms used chemical reactions as a source of energy?
What type of organisms used chemical reactions as a source of energy?
What was the reason for the emergence of animals?
What was the reason for the emergence of animals?
What life forms were found in rocks from 3.5 to 2.1 billion years ago?
What life forms were found in rocks from 3.5 to 2.1 billion years ago?
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Study Notes
- First forms of life were heterotrophic prokaryotes.
- Autotrophs evolved as the organic molecules in the seas depleted.
- Prokaryotes gave rise to three distinct lines of evolution: Archeabacteria, Eubacteria, and Eukaryotes.
- Photosynthesis produced oxygen, leading to the evolution of aerobic respiration.
- Cyanobacteria were among the earliest autotrophs and used phycocyanin to capture light energy.
- Chemo-autotrophs used chemical reactions as a source of energy.
- Bacteria are the only life forms found in rocks from 3.5 to 2.1 billion years ago.
- Eukaryotes became numerous 1.9 to 2.1 billion years ago.
- Fungi-like organisms appeared about 0.9 billion years ago.
- Animals evolved around 600 to 700 million years ago due to the increased energy release from aerobic respiration.
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