Which of the following adds to the rigidity of the wall and allows some bacteria to bind to host cells? O Lipid A O Arabinoglycan O Teichoic acid O Lysozyme O Outer membrane
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It is a polymer of glycerol phosphate or ribitol phosphate linked by phosphodiester bonds. Teichoic acids are negatively charged and contribute to the rigidity of the cell wall. They also play a role in the attachment of bacteria to host cells. Show more…
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Which of the following attaches the gram-negative outer membrane to the peptidoglycan layer? porins Sec translocase lipoprotein fimbriae Question 2 What molecule cleaves the ̢-1,4 bond between N-acetylglucosamine and N-acetylmuramic acid? lysozyme diaminopimelic acid
Adi S.
Which of the following is a function of peptidoglycan? - Regulation of the passage of nutrients into the cytoplasm - Creation of a gradient of protons (proton motive force) - Prevention of cell lysis - Breakdown of nutrients too large to transport across the cell membrane If you had a cell with the following structures, which would be the outermost layer of this hypothetical cell? - Peptidoglycan - Capsule - LPS - Cytoplasmic membrane What portion of the gram-negative cell envelope is called endotoxin and triggers inflammation and fever in humans? - Peptidoglycan - Porins - O-polysaccharide - Lipid A
2. The peptidoglycan is a cell wall polymer and the enzyme lysozyme inhibits the formation of: A. Teichoic acid B. Lipopolysaccharide C. Backbone which is composed of two amino sugars (N-acetylglucosamine and N-Acetyl muramic acid) D. Tetrapeptide side chains E. peptide cross bridges 3. The process by which a bacteriophage (virus) carries a small fragment of the chromosome or a plasmid from one bacterial cell to another is called: A. Transformation B. Conjugation C. Transduction D. Transfection 4. Most bacteria reproduce by: A. Budding B. Conjugation C. Spores D. Binary Fission (transverse fission) 5. Infections caused by Mycoplasma pneumoniae can be treated with: A. Penicillin B. Cephalosporins C. Ampicillin D. Tetracycline 6. Escherichia coli: A. is a gram-negative bacilli B. has a cell wall that contains an endotoxin C. is a gram-positive bacilli D. A and B E. B and C
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