Gram-staining

Which part of a bacteria cell wall "holds" the stain? 

• plasma membrane
• fimbriae
• peptidoglycan
• pilus

These bacteria are

• gram positive
• gram negative
• nonliving
• viral

Tags

NGSS.MS-LS1-1

These bacteria are

• nonliving
• gram positive
• gram negative
• gram positive and gram negative

These bacteria are

• gram positive and negative
• gram positive
• gram negative
• viral

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

Which is applied last in gram staining?

• alcohol
• crystal violet
• safranin
• grams iodine

Which type of bacteria contains more than 1 layer of phospholipids?

• Gram Negative

• Gram Positive

• Both (-) and (+)

Which is applied first in gram staining?

• alcohol
• grams iodine
• crystal violet
• safranin

Which reagent is used as the decolorizer?

• Crystal Violet
• Iodine
• Ethanol
• Safranin

Which is the mordant (used to solidify the crystal violet stain onto the peptidoglycan)?

• water

• saffranin

• alcohol

• iodine

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