How do prokaryotic cells live ..
Examples of anoxygenic photosynthetic bacteria include purple bacteria and green bacteria. Purple bacterial cells come in a (spherical, rod, spiral) and these cells may be motile or non-motile. Purple sulfur bacteria are commonly found in aquatic environments and sulfur springs where hydrogen sulfide is present and oxygen is absent. Purple non-sulfur bacteria utilize lower concentrations of sulfide than purple sulfur bacteria and deposit sulfur outside their cells instead of inside their cells. Green bacterial cells are typically spherical or rod-shaped and the cells are primarily non-motile. Green sulfur bacteria utilize sulfide or sulfur for photosynthesis and can not survive in the presence of oxygen. They deposit sulfur outside of their cells. Green bacteria thrive in sulfide-rich aquatic habitats and sometimes form greenish or brown blooms.
However, prokaryotic cells do not have complex ..
Similar to plants and algae, some prokaryotes also have photosynthetic pigments. These light absorbing pigments enable photosynthetic bacteria to obtain nutrition from light.
As you can see cyanobacteria are a very hot topic concerning both their potential health risks and health assets. This variety of seeing cyanobacteria as both a potential danger and a potential medicine corresponds with the wide variety of blue-green algae that make up the division . When talking about cyanobacteria we are talking about a whole range of species that differ in habitat, organization, health potential, and nutrition, just to name a few. They all have unifying characteristics such as being prokaryotic, having chlorophyll , and the liberation of O2 during photosynthesis, but along with all these similarities they have an equally long list of differences. Some secrete harmful biotoxins and others help to inhibit the growth of retroviruses. When talking about cyanobacteria in general you have to just look at the basic similarities that exist among the species, but at the same time you have to recognize that major differences also exist.
Prokaryotes by definition lack such structures
Photosynthetic prokaryotes also contain pigments used in the capture of light energy; marine bacteria contain gas bubbles which help them keep afloat; still others have tiny deposites of iron in their cytoplasm which act like magnets and help orientate them with the earth's magnetic field.
Prokaryotic photosynthesis and phototrophy …
Prokaryotic cells lack organelles found in eukaryoitic cells such as , , and . According to the , eukaryotic organelles are thought to have evolved from prokaryotic cells living in endosymbiotic relationships with one another.
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Prokaryotic cells are not as complex as . They have no true as the is not contained within a membrane or separated from the rest of the cell, but is coiled up in a region of the called the nucleoid. Prokaryotic organisms have varying cell shapes. The most are spherical, rod-shaped, and spiral.
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Blue-green algae make up the division in the kingdom Monera, which is made up of about 1,500 species of prokaryotic organisms. There is disagreement on whether or not this division should be considered algae or bacteria. Cyanobacteria (Blue Green Algae) differ from other types of bacteria in that they have chlorophyll which other photosynthetic bacteria don’t have. Another characteristic that supports the algae argument is the fact that free oxygen is given off in blue-green algae photosynthesis but it is not given off in the photosynthesis of other bacteria. Many bacteria split H2S instead of H2O as a source of electrons during their photosynthesis; this is why they don’t produce free O2. These other bacteria have bacteriochlorophyll instead of chlorophyll as their main photosynthetic pigment (Bold, 1985). Evidence supporting the bacteria argument has to do with blue-green algae’s cellular organization. They are prokaryotic (no membrane-bound organelles), they have only a haploid life cycle (while all algae life cycles have an alteration of generation), they reproduce through fission, they don’t have cellulose in their cell walls, their DNA is not associated with histone proteins in their chromosomes (unlike algae and other plants) (Clark, 1998).
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In large measure the actual structure of one of these cells reflects the way in which it acquires energy, but, despite their diversity, all prokaryotic cells have the following features in common.