Peptidoglycan crosslinks: Group of answer choices (D) give the bacterial cell wall strength (B) may be inhibited from forming with Lysozyme (E) composed of glycosidic bonds (C) only found in Gram positive cells (A) a common structure in animal cells
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It is hypothesized that the D-amino acids in the peptidoglycan impart this function to the bacterial cell wall. A) They provide crosslinking strength to the cell wall. B) They provide permeability selection. C) They are resistant to attack by host proteases. D) They are not detected by host immune cells.
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Which of the following statements is true about Gram-positive bacteria? Choose all that apply. Select one or more: a. contains endotoxin as a component of the cell wall b. contains teichoic acid as part of the peptidoglycan c. contains peptidoglycan in the cell wall d. contains various O antigens that are used to distinguish pathogenic strains of Escherichia coli e. usually sensitive to penicillin f. contains an outer membrane
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Penicillin binding proteins are a class of enzymes that have 2 types of activities needed in the synthesis of the bacterial cell wall. They are: A) peptidyltransferase and peptide hydrolase activities B) transglycosylase and transpeptidase activities C) transglycosylase and peptidyltransferase activities D) beta-lactamase and carboxypeptidase activities The bacterial cell wall unit N-acetylmuramylpentapeptide is made inside the cell and attached to a lipid. How does it get to the outside? A) through the RND efflux pump B) through the ABC transporters C) an integral membrane enzyme called MurJ D) exocytosis It is hypothesized that the D-amino acids in the peptidoglycan impart this function to the bacterial cell wall. A) They provide crosslinking strength to the cell wall B) They provide permeability selection C) They are resistant to attack by host proteases D) They are not detected by host immune cells Helicobacter pylori is a causative agent of ulcers and is generally found where? A) Colon B) Ileum C) Gall bladder D) Upper GI In newborns, their gut microbiome composition can be influenced by: A) the mother B) caregivers C) pets and animals D) the skin E) all of the above
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