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Figure 10.7 Chromatogram of the Fatty Acid Profiles Each peak represents a different fatty acid; the size of the peak correlates with the relative amount of that particular molecule. (a) A chromatogram of the fatty acids of Pseudomonas cepacia and (b) a chromatogram of the fatty acids of a closely related species, Pseudomonas aeruginosa.

are sometimes unique enough to be considered identifying markers. Cellular fatty acid composition can be used as an identifying characteristic.

■ How does MacConkey agar help to identify the cause of a urinary tract infection?

■ Describe two methods that can be used to test for the enzyme urease.

■ Why must a sample contain many microorganisms for any to be viewed by microscopic examination?

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