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                                    The following picture shows a bacterial lawn in an agar plate with few clear zones. The zones are formed due to a chemical present in the disk at the centre of each zone. This chemical brings about a breakdown of bacterial cells and hence the clear zones. What is this chemical called and what are the primary sources of it? Bacterial culture plate with clear zones | 
                            
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Answer»  The following picture shows a bacterial lawn in an agar plate with few clear zones. The zones are formed due to a chemical present in the disk at the centre of each zone. This chemical brings about a breakdown of bacterial cells and hence the clear zones. What is this chemical called and what are the primary sources of it? 
 
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