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Figure 7-5 Page 122 Photosynthetic Membranes (thylakoids) Cyanobacteria carry out photosynthesis with chlorophyll bound to proteins in membranes infolding from the cell membrane. This is an artificially-colored micrograph from transmission electron microscopy (TEM)
Cyanobacterial Vegetative Cell: cell wall cell membrane lipid droplet nucleoid polyhedral body RuBisCO cyanophycin thylakoids cyanophycean starch gas vacuole polyphosphate granule mesosome 70S ribosome light (ETS)reacti ons Calvin cycle sugar synthesis glycolysis Krebs cycle CO CH 2 O ETS reactions cytosol light chlorophyll H2OH2O O2O2 Photosynthesis Respiration CH 2 O + H 2 O + energy O 2 + CO 2
An artificially colored TEM of a cyanobacterium. Thylakoids contain chlorophyll a (green) Metabolism? Association? Shape?
In a light microscope image: Thylakoids are too fine to be visible, so the green color appears throughout cytosol but with the nucleoid region lighter in color. The DNA displaces some of the naturally dark- green thylakoids. In dyed TEM image: Thylakoids were dyed green to show the location of bacteriochlorophyll for the light reactions… nabaena_cylindrica_629.jpg nucleoid