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Unformatted text preview: lved and consist of many different groups Review: In Chapter 4 we noted the Review: In Chapter 4 we noted the differences between prokaryotes and eukaryotes • Prokaryotes have no • membrane bound organelles such as mitochondria or chloroplasts. They are more primitive than eukaryotes Cyanobacteria (blue green algae) are the most primitive of the oxygenic Cyanobacteria (releasing O2 in photosynthesis) autotrophs. These are prokaryotes. Throughout surface waters of the world’s oceans (except cold <5oC, polar regions), there are about (1,000­10,000) Synechococcus cells/ml. Cells in this genus are unicellular and about 1 µm in diameter (about the size of a typical bacterium). Their abundance in the sea was not discovered until the 1970s A second major genus of cyanobacteria in the sea is Prochlorococcus. A second major genus of cyanobacteria in the sea is These were discovered in the 1990s. These are also small, bacteria­ sized prokaryotic cells. They are as abundant as Synechococcus, but they differ in...
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