characteristic ao they test to) 6.) Which types of media used in this lab exerci

Question

characteristic ao they test to) 6.) Which types of media used in this lab exercise are selective for Gram + organisms? 7) On what basis are the Gram + selective media also differential? (What characteristic do they test for)? 8.) What color is mannitol salt agar before it is inoculated? 9.) How can the appearance of this plate change with a positive differential result? 10.) What color is MacConkey agar before it is inoculated? 11-12.) How can the appearance of this plate change with different positive differential results? (2 pts) 13.) What color is eosin methylene blue agar before it is inoculated? 14-15.) How can the appearance of this plate change with different positive differential results? (2 pts)

Explanation / Answer

Ans 6 :

The gram + organisms are the ones that have a thick cell wall made up of glycoprotein. These organisms when stain with the cystal violet dye , retain their color , and hence easily identifiable under the microscope.

The media selective for gram posituve organisms is mannitol salt agar.

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