What is a lipopolysaccharide?
A type of protozoa
A hormone secreted by the pancreas
A large lipid molecule
A large molecule in the cell wall of gram-negative bacteria
Answer
Lipopolysaccharides (LPS) are large molecules that make up the outer layer of the cell wall of gram-negative bacteria. They are made up of a lipid portion and a polysaccharide portion. The lipid portion is called lipid A and is responsible for the toxicity of LPS. The polysaccharide portion is called the O-antigen and is responsible for the antigenic properties of LPS.
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