Microbiology Lab Quiz

What is the purpose of staining in medical microbiology?

• To observe bacterial morphology and arrangements

• To identify different types of organisms

• To stain the background, not the cells

• To detect organisms with a waxy substance in the cell wall

Which type of stain is used to determine if bacteria is gram positive or negative?

• Acid-Fast stain

• Capsule stain

• Gram stain

• Endospore stain

What is the purpose of an Acid-Fast stain?

• To observe bacterial morphology and arrangements

• To identify different types of organisms

• To detect organisms with a waxy substance in the cell wall

• To stain the background, not the cells

Which bacterial genera produce endospores?

• Bacillus and Clostridium

• Mycobacterium

• Bacillus subtilus

• Mycobacterium tuberculosis

What is the purpose of an endospore stain?

• To observe bacterial morphology and arrangements

• To identify different types of organisms

• To detect organisms with a waxy substance in the cell wall

• To stain endospores within bacterial cells

Why do bacterial capsules not adhere to acidic or basic stains?

• Because they are non-ionic

• Because they have a thick layer of peptidoglycan

• Because they have a thin layer of peptidoglycan

• Because they have a waxy substance in the cell wall

Which type of stain is used to stain the background of the slide?

• Gram stain

• Acid-Fast stain

• Capsule stain

• Endospore stain