Lab 6 Gram Stain - Microbiology

In the Gram stain, which part of a bacteria cell wall "holds" the primary stain? 

• plasma membrane

• fimbriae

• peptidoglycan

• pilus

This is the cell wall of a ______ bacteria

• Gram positive

• Gram negative

• impossible to tell

• acid fast

The shape of this bacterial cell is

• coccus

• bacillus

• spirilla

• coccobacillus

The arrangement of this bacteria is

• clusters

• chains

• tetrads

• endospores

The arrangment of this bacteria is

• clusters

• chains

• tetrads

• endospores

After heat-fixing, which is applied first in Gram staining?

• alcohol

• Grams iodine

• crystal violet

• safranin

Which is applied last in the Gram staining process?

• alcohol

• crystal violet

• safranin

• grams iodine

These bacteria were Gram stained, you can conclude they are

• Gram positive and Gram negative

• Gram positive

• Gram negative

• Acid fast

Which of the following is the CORRECT order of the steps of a Gram stain?

• Primary stain → Decolorizing agent → Mordant → Counterstain

• Counterstain→ Mordant → Decolorizing agent→ Primary stain

• Primary stain→ Mordant→ Decolorizing agent→ Counterstain

• Primary stain→ Counterstain→ Decolorizing agent→ Mordant

Gram positive bacteria will be stained in __________ color after Gram staining procedure?

• Red

• Pink

• Blue

• Purple