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After Christian Gram developed the Gram stain in 1884, it soon became evident that bacteria could be divided into two major groups based on their response to the Gram-stain procedure. Gram-positive bacteria stained purple, whereas gram-negative bacteria were colored pink or red by the technique. The true structural difference between these two groups became clear with the advent of the transmission electron microscope. The gram-positive cell wall consists of a single 20 to 80 nm thick homogeneous peptidoglycan or murein layer lying outside the plasma membrane. In contrast, the gram-negative cell wall is quite complex. It has a 2 to 7 nm peptidoglycan layer surrounded by a 7 to 8 nm thick outer membrane. Because of the thicker peptidoglycan layer, the walls of gram-positive cells are stronger than those of gram-negative bacteria. Microbiologists often call all the structures from the plasma membrane outward the envelope or cell envelope. This includes the wall and structures like capsules when present.
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What cell wall is toxic to humans?
the Gram-Negative Wall!
What characteristic does a gram stain indicate?
The difference between gram-positive and gram-negative bacteria.
Is mycolic acid found in gram positive and gram negative cell wall composition?
mycobacterium
What is the type of coating on a bacteria cell?
In bacteria, the cell wall is composed of peptidoglycan, and is essential to the survival of many bacteria. Bacteria have been classified into Gram-positive and Gram-negative based on the structure of the cell wall. Gram-positive bacteria possess thick cell wall consisting of many layers of peptidoglycan and teichoic acids. Gram-negative bacteria have relatively thin cell wall consisting of few layers of peptidoglycan.
Can you gram stain a cell without a cell wall?
No bacteria exist without a cell wall! If they loose cell wall then they die. Gram staining is used to differentiate gram positive (that doesnt have outer membrane) and gram negative (cell wall+outer membrane) bacteria.
What cell wall is toxic to humans?
the Gram-Negative Wall!
Is there periplasmic space in both gram positive and gram negative?
The periplasm is a region in the cell wall of Gram-negative bacteria
Are polymers gram negative?
A gram stain tests the contents of the cell wall. Polymers do not have cell walls.
Are human cells gram positive?
Human cells are Gram-negative because they do not contain certain structures. More simply, if they don't have a cell wall they cannot be Gram-positive.
Name the different gram positive and gram negative bacteria?
Name of gram positive and gram negative bacteria?
What characteristic does a gram stain indicate?
The difference between gram-positive and gram-negative bacteria.
Why is chlamydia gram negative?
it explains its added resistance. it is gram negative due to it's enhanced cell wall, etc.
Is mycolic acid found in gram positive and gram negative cell wall composition?
mycobacterium
What is the difference between gram-positive and gram-negative bacteria?
The presence of thick cell wall. Gram positives have a thick cell wall and remain blue. Gram negatives have a thin cell wall where the blue stain washes out and then will stain pink with the counter stain.
Is gram positive hypertonic or hypotonic?
Neither. The structure of the gram negative cell wall protects the cell from hypotonic solutions. Is this what you were asking?
What is one way of classifying bacteria?
gram negative or gram positive, depending on cell wall composition
What is the type of coating on a bacteria cell?
In bacteria, the cell wall is composed of peptidoglycan, and is essential to the survival of many bacteria. Bacteria have been classified into Gram-positive and Gram-negative based on the structure of the cell wall. Gram-positive bacteria possess thick cell wall consisting of many layers of peptidoglycan and teichoic acids. Gram-negative bacteria have relatively thin cell wall consisting of few layers of peptidoglycan.
