How many liters of air should be injected into the unit when calibrating the spirometer?

A gram-positive bacterium retains the ________ color of the stain used in the staining of the microorganism

a. red b. white c. violet d. green

Work surfaces in the buffer room must be made of stainless steel or:

A) Copper mesh. B) Molded plastic. C) Marble or granite. D) Ceramic tile.