Chapter 27

Chapter 27 Prokaryotes and the Origins of Metabolic

I. They’re almost everywhere ,[object Object],[object Object],[object Object]

B. Bacteria and archaea are the two main branches of prokaryotic evolution ,[object Object],[object Object]

[object Object],Bacteria Archaea Eukarya

A Comparison of the Three Domains of Life Present Present Present Nuclear membrane Eukarya Archaea Bacteria

Present Absent Absent Membrane-enclosed organelles Eukarya Archaea Bacteria

Absent Absent Present Peptidogylcan in cell wall Eukarya Archaea Bacteria

Several kinds Several kinds One kind RNA polymerase Eukarya Archaea Bacteria

Methionine Methionine Formyl-methionine Initiator amino acid for start of protein synthesis Eukarya Archaea Bacteria

Present Present in some genes Absent Introns Eukarya Archaea Bacteria

Growth not inhibited Growth not inhibited Growth inhibited Response to antibiotics and streptomycin and chloramphenicol Eukarya Archaea Bacteria

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C. Nearly all prokaryotes have cell walls external to their plasma membranes ,[object Object]

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D. Most prokaryotes are motile ,[object Object],[object Object]

E. The cellular and genomic organization of prokaryotes is fundamentally different from that of eukaryotes ,[object Object],[object Object]

F. Populations grow and adapt rapidly ,[object Object]

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Cell shape ,[object Object],[object Object],[object Object]

Internal Membranes ,[object Object]

Reproduction and Growth ,[object Object],[object Object]

II. Great diversity of Nutritional and metabolic adaptations: all organisms can be classified by how they obtain their energy and organic carbon compounds

III. Oxygen requirements ,[object Object]

IV. Ecological role of Prokaryotes ,[object Object]

B. Involved in symbiotic relationships ,[object Object],[object Object],[object Object]

C. Agents of disease ,[object Object],[object Object]

Chapter 27

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Chapter 27