Gram Stain PM

1. What is the counterstain in the Gram stain procedure?

A. Crystal Violet

B. Gram’s iodine

C. Alcohol

D. Safranin

2. At the end of the Gram stain procedure, what color will a Gram negative cell stain?

A. Purple

B. Pink

C. No Color

D. Pink and Purple

3. What component of the cell wall are we staining?

A. Capsule

B. Peptidoglycan

C. Polysaccharide

D. Protein

4. Gram positive cells have a(n)

A. thick peptidoglycan layer

B. thin peptidoglycan layer

C. thick capsule layer

D. thin capsule layer

5. A Gram Negative cell, following the alcohol decolorization step would be?

A. purple

B. no color

C. pink

D. blue

6. The picture below is a picture of

A. Gram negative cells

B. Gram positive cells

C. Gram variable cells

D. Not bacterial cells