1.10 Gram Stain

What is the primary purpose of a Gram stain in microbiology?

• To measure the size of bacteria

• To differentiate between types of bacteria

• To determine the age of bacteria

• To identify the shape of bacteria

Which color do Gram-positive bacteria appear after a Gram stain?

• Red

• Green

• Purple

• Yellow

What is the main component of the cell wall in Gram-positive bacteria that retains the crystal violet stain?

• Lipopolysaccharide

• Peptidoglycan

• Phospholipid

• Protein

What color do Gram-negative bacteria appear after a Gram stain?

• Blue

• Pink

• Orange

• Brown

What category does Bacteria A belong to based on its shape?

• Cocci

• Spirilla

• Bacilli

• Vibrios