MCQOPTIONS
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				| 1. | 
                                    In which of the following organism does iron secreted to form stalks or ribbons attached to the cell? | 
                            
| A. | Sphaerotilus | 
| B. | Gallionella | 
| C. | Thiobacillus | 
| D. | Streptococcus | 
| Answer» C. Thiobacillus | |