INCLUSIONS - Mycobacterium, Bacillus and others. d. Sulfur...

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INCLUSIONS ----these are reserve deposits of chemicals within the cytoplasm. They tend to  accumulate when nutrients are plentiful.  a. Metachromatic granules (volutin granules)---phosphate reserve that can  be used in synthesizing ATP. These large granules stain red with methylene blue. They are  characteristic of  Corynebacterium diphtheriae.  These granules are also found in algae, fungi, and  protozoa. b. Polysaccharide granules---glycogen granules (which iodine stains reddish brown) and starch  granules (which iodine stains blue). c. Lipid inclusions- most common is poly- β  -hydroxybutyric acid (PHB). Found in 
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Unformatted text preview: Mycobacterium, Bacillus and others. d. Sulfur granules- bacteria whose metabolism involves oxidizing sulfur may deposit these as an energy reserve. Thiobacillus is an example. e. Carboxysomes-bacteria that use CO 2 as their only carbon source form these granules containing an enzyme required in the process. f. Gas vacuoles- these are adjusted so that the cell that contains them can float at the proper depth in water. g. Magnetosomes- inclusions of iron oxide that act like magnets. Function uncertain, but they apparently can decompose hydrogen peroxide....
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