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Christian Gram divided the bacteria into 2 types basing on the cell wall composition-Gram negative bacteria and Gram positive bacteria.
Gram negative bacteria have low content of peptidoglycan in their cell wall and high content of lipopolysaccharides.Gram negative bacteria have the outermembrane.Outermembrane can be divided into 3 parts--lipidA,O side chains and Lipoproteins.
Lipid A is responsible for endotoxins[the pathogenecity of Gram negative bacteria is due to lipid A
O side chains are the O antigens [the antibodies of the host recognizes the bacteria with the help of O antigens.
Lipopolysaccharides--present in much higher levels in gram negative bacteria than in gram positive bacteria.The lipoproteins are attached to the polysaccharide backboneand these are called as Braun's lipoproteins.
The outer membrane is more permeable than the plasmamembrane and this nature comes from porins,which help in the transport of fluids.
Examples of Gram negative bacteria include:E.coli,Pseudomonas,Salmonella etc
Wiki User
∙ 16y ago
Wiki User
∙ 10y agoGram negative bacterium are bacterium that do not hold the dye used to to identify them as gram positive bacterium.
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Do gram negative bacteria produce spores?
because all gram nagative bactria does not have all nutrients in their cell membrane and muramic acid & some enzymes also doesn't have for their spore forming & protectein....
Is E. coliK12 gram positive or gram negative?
E. coli is Gram-negative.
What is most common gram positive or gram negative bacteria?
gram negative
Pseudomonas Aeruginosa gram positive or gram negative?
gram-negative of course
Is Vibrio cholerae gram-negative?
It is gram-negative
Do gram negative bacteria produce spores?
because all gram nagative bactria does not have all nutrients in their cell membrane and muramic acid & some enzymes also doesn't have for their spore forming & protectein....
Are coliforms gram-positive or gram negative?
Gram negative
Is Escherichia coli gram negative or gram positive?
it is Bacillus with gram negative.
Is salmonella typhimurium gram positive?
It is gram negative
Is E. coliK12 gram positive or gram negative?
E. coli is Gram-negative.
Is endospores are gram positive or gram negative?
gram negative
Is cholera gram negative or gram positive?
gram negative
What is the gram stain for cholera?
Gram Negative
Is klebsiella gram positive or negative?
i believe it is a gram bacteria which causes respiratory illness.
Is conjunctivitis gram negative?
Gram-negative
Is moraxella catarrhalis gram positive or gram negative?
gram negative
Is campylobacter jejuni gram positive or gram negative?
gram negative
