XULA Microbiology Exam 1 Questions with Correct Answers Latest Update 2025/2026
Which feature of E.coli is important for attachment to host epithelial cells? - Answers pili
O antigen found on some bacteria is: - Answers part of cell wall lipopolysaccharide
Movement of DNA from one bacteria to another through tubular bridge or pilus: - Answers
conjugation
NOT one of Koch's postulates: - Answers treatment of disease with broad spectrum oral
antimicrobial dependably eradicates organism and cures disease
characteristics of bacterial capsule: - Answers protect bacterium against phagocytosis
chemical that removes cell wall from bacteria but leaves organism undamaged otherwise, thing
bacteria will lose: - Answers ability to have a gram stain result
characteristic of mycobacteria: - Answers acid fast and gram positive
first and most useful microscopic test for classifying bacteria - Answers gram stain
gram-staining is example of: - Answers differential staining
high concentration of what in acid-fast cell walls? - Answers lipids
if decolorizer is left on too long: - Answers gram positive will be pink and gram negative will be
pink
which is not a class of growth factors? - Answers nucleic acids
nutrients can be concentrated from dilute solutions by: - Answers active transport and group
translocation
characteristics of active transport: - Answers saturable uptake rate, use of ATP or PMF, can
move materials against concentration gradient
peptide interbridges often found in peptidoglycan cell wall of: - Answers Gram positive bacteria
not part of peptidoglycan: - Answers core polysaccharide
lipopolysaccharide found in outer membrane of gram - bacteria: - Answers endotoxin
Emil von Behring and Shibasaburo Kitasato demonstrated that inactivated toxins can induce
synthesis of antitoxins in blood of rabbits. antitoxins (antibodies) are basis of: - Answers
humoral immunity
outer membrane and cytoplasmic membrane both have: - Answers phospholipids
plasmid is only found in bacteria (T or F) - Answers false
Which feature of E.coli is important for attachment to host epithelial cells? - Answers pili
O antigen found on some bacteria is: - Answers part of cell wall lipopolysaccharide
Movement of DNA from one bacteria to another through tubular bridge or pilus: - Answers
conjugation
NOT one of Koch's postulates: - Answers treatment of disease with broad spectrum oral
antimicrobial dependably eradicates organism and cures disease
characteristics of bacterial capsule: - Answers protect bacterium against phagocytosis
chemical that removes cell wall from bacteria but leaves organism undamaged otherwise, thing
bacteria will lose: - Answers ability to have a gram stain result
characteristic of mycobacteria: - Answers acid fast and gram positive
first and most useful microscopic test for classifying bacteria - Answers gram stain
gram-staining is example of: - Answers differential staining
high concentration of what in acid-fast cell walls? - Answers lipids
if decolorizer is left on too long: - Answers gram positive will be pink and gram negative will be
pink
which is not a class of growth factors? - Answers nucleic acids
nutrients can be concentrated from dilute solutions by: - Answers active transport and group
translocation
characteristics of active transport: - Answers saturable uptake rate, use of ATP or PMF, can
move materials against concentration gradient
peptide interbridges often found in peptidoglycan cell wall of: - Answers Gram positive bacteria
not part of peptidoglycan: - Answers core polysaccharide
lipopolysaccharide found in outer membrane of gram - bacteria: - Answers endotoxin
Emil von Behring and Shibasaburo Kitasato demonstrated that inactivated toxins can induce
synthesis of antitoxins in blood of rabbits. antitoxins (antibodies) are basis of: - Answers
humoral immunity
outer membrane and cytoplasmic membrane both have: - Answers phospholipids
plasmid is only found in bacteria (T or F) - Answers false
