(1) Why do people usually say that "'Gram-negative bacteria evolve more types of protein secretion systems than Gram-positives due to the compiexity of their cel! wall structure"? (4%)

VI. (9%) Please design an experiment using a selective medium to isolate a particular microorganism. In this experimental design, please provide (1) the objective of your experiment, (2) which microorganism you want to isolate, (3) which selective medium you choose and (4) why this medium can be used to isolate the microor you choose. Part B:(50% microscope

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(1) Why do people usually say that "'Gram-negative bacteria evolve more types of protein secretion systems than Gram-positives due to the compiexity of their cel! wall structure"? (4%)

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