Preparing and Reading Gram Stains

Preparing and Reading Gram Stains

Multiple Choice

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

Multiple Choice

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

• Red

• Green

• Purple

• Yellow

Multiple Choice

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

• Lipopolysaccharide

• Peptidoglycan

• Phospholipid

• Protein

Multiple Choice

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

• Blue

• Pink

• Orange

• Brown

Multiple Choice

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

• Cocci

• Spirilla

• Bacilli

• Vibrios

Multiple Choice

What is this bacteria shape?

• Coccus

• Bacillus

• Spirillum

Multiple Choice

Which type of bacteria has an outer lipid membrane?

• Gram-positive

• Gram-negative

• Acid-fast

• Mycoplasma

Multiple Choice

These bacteria are:

• both gram positive and gram negative

• gram positive

• gram negative

Multiple Choice

These bacteria are:

• gram positive

• gram negative

• both gram positive and gram negative