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Glossary of biolab

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Are endotoxins secreted from cells?
NO
Are endotoxins used as antigens in vaccines?
no, they don't produce protective immune response
Are exotoxins heat stable?
no, destroyed rapidly at 60C (exception: Staphylococcal enterotoxin)
Are exotoxins secreted from cells?
YES
Are exotoxins used as antigens in vaccines?
Yes, TOXOIDS are used as vaccines
Describe the chemical composition of peptidoglycan.
Sugar backbone with cross-linked peptide side chains.
Describe the major components of a G- cell wall.
inner and outer lipid bilayer membranes - thin layer of peptidoglycan - periplasmic space - contains lipopolysaccharide, lipoprotein and phospholipid
Describe the major components of a G+ cell wall.
one lipid bilayer membrane - thick layer of peptidoglycan - contains teichoic acid
Describe the process of conjugation.
DNA transfer from one bacterium to another.
Describe the process of transduction.
DNA transfer by a virus from one cell to another

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