What is a Prokaryote?

1. Name the 3 domains of living organisms and indicate which ones have prokaryotic cells.

2. Indicate when prokaryotes appeared on earth, relative to eukaryotes.

3. Describe the general appearance of bacteria and Archaeans; what is the main way in which these groups differ?

4. Describe several extreme environments in which some prokaryotes can live; how might these "extremophiles" be important to humans?

5. Why do some biologists think that life on other planets may resemble certain prokaryotes? (including reading assignments)

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