What are gram-positive bacteria?
Q: What are gram-positive bacteria?
A: Gram-positive bacteria are those that are stained dark blue or violet by Gram staining.
Q: What is the difference between gram-positive and gram-negative bacteria?
A: Gram-positive bacteria can hold the crystal violet stain while gram-negative bacteria cannot. Gram-negative bacteria take up the counterstain instead and appear red or pink.
Q: Why do gram-positive organisms not need rigid cell walls?
A: Gram-positive organisms have a thick peptidoglycan layer which gives them protection, so they do not need rigid cell walls.
Q: Why do gram-negative bacteria need rigid cell walls?
A: Gram-negative bacteria have thin, insignificant peptidoglycan layers, so they do need rigid cell walls for support and protection.
Q: How are gram-positive bacteria stained during Gram staining?
A: Gram-positive bacteria are stained dark blue or violet during Gram staining.
Q: What is the structure of the cell wall of gram-positive bacteria?
A: Gram-positive bacteria have a thick peptidoglycan layer.
Q: What is the structure of the cell wall of gram-negative bacteria?
A: Gram-negative bacteria have thin, insignificant peptidoglycan layers.
