Podcast
Questions and Answers
What happens to crystal violet in Gram-negative bacteria during Gram staining?
What happens to crystal violet in Gram-negative bacteria during Gram staining?
- It is retained in the cell wall
- It changes to a red color
- It is easily rinsed away (correct)
- It prevents the uptake of the red dye
What is the primary component of the peptidoglycan layer in Gram-negative bacteria?
What is the primary component of the peptidoglycan layer in Gram-negative bacteria?
- Omps
- Peptidoglycan (correct)
- Lipopolysaccharides
- Teichoic acids
What is the function of the capsule in Gram-negative bacteria?
What is the function of the capsule in Gram-negative bacteria?
- To anchor the flagella
- To provide structural support
- To facilitate nutrient uptake
- To protect against phagocytosis (correct)
What is a characteristic of the cell wall of Gram-negative bacteria?
What is a characteristic of the cell wall of Gram-negative bacteria?
What is a component of the outer membrane of Gram-negative bacteria?
What is a component of the outer membrane of Gram-negative bacteria?
What traps crystal violet in Gram-positive bacteria?
What traps crystal violet in Gram-positive bacteria?
What is the main component of the cell wall in Gram-positive bacteria?
What is the main component of the cell wall in Gram-positive bacteria?
What is the function of the capsule in bacteria?
What is the function of the capsule in bacteria?
What is the purpose of Gram staining?
What is the purpose of Gram staining?
What is the outermost layer of Gram-negative bacteria?
What is the outermost layer of Gram-negative bacteria?
What is the main component of the cell wall in Gram-positive bacteria?
What is the main component of the cell wall in Gram-positive bacteria?
What is the function of the capsule in many prokaryotes?
What is the function of the capsule in many prokaryotes?
What is the typical size of the Gram-staining unit?
What is the typical size of the Gram-staining unit?
What is the outermost layer of the Gram-negative bacterial cell wall?
What is the outermost layer of the Gram-negative bacterial cell wall?
What is the main component of the Gram-negative bacterial cell wall?
What is the main component of the Gram-negative bacterial cell wall?
What is the primary function of the peptidoglycan layer in Gram-positive bacteria?
What is the primary function of the peptidoglycan layer in Gram-positive bacteria?
Flashcards are hidden until you start studying
Study Notes
Gram Staining
- Gram-positive bacteria: peptidoglycan traps crystal violet, resulting in a purple color.
- Gram-negative bacteria: crystal violet is easily rinsed away, revealing a red color.
Cell-Surface Structures of Bacteria
- Cell wall consists of peptidoglycan (also known as murein) layer.
- Outer membrane is present in Gram-negative bacteria.
- Cell wall is 10 μm in thickness.
- Capsule: a polysaccharide or protein layer that covers many prokaryotes, enabling them to adhere to their substrate or to other individuals in a colony.
Key Differences between Gram-Positive and Gram-Negative Bacteria
- Presence of outer membrane: Gram-negative bacteria have an outer membrane, while Gram-positive bacteria do not.
- Peptidoglycan layer: Gram-positive bacteria have a thick peptidoglycan layer, while Gram-negative bacteria have a thin peptidoglycan layer.
- Lipopolysaccharide: Gram-negative bacteria have a lipopolysaccharide layer in their outer membrane, which is not present in Gram-positive bacteria.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
