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MCB 2610 Exam 3 Questions with complete solution 2024/2025
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MCB 2610 Exam 3 Questions with complete solution 2024/2025 MCB 2610 Exam 3 Shigella flexneri - correct answer - single rods/short chain -causes shiglosis(dysenteria) -gram negative -facultative aerobe -catalase positive -oxidase negative - no flagella -non spore forming -grows op...

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  • October 17, 2024
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  • 2024/2025
  • Exam (elaborations)
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  • mcb 2610 exam 3
  • mcb 2610 exam 3 questions with complete solution

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MCB 2610 Exam 3
Shigella flexneri - correct answer ✔- single rods/short chain
-causes shiglosis(dysenteria)
-gram negative
-facultative aerobe
-catalase positive
-oxidase negative
- no flagella
-non spore forming
-grows optimally at 37 degrees C


Haemophilus influenzae - correct answer ✔- opportunistic pathogen
- usually grown in chocolate agar(needs specific factors to grow)
- spread via respiratory droplets
- type B causes bacteremia and meningitis
- coccobacilli
- gram negative
- no flagella
- facultative anaerobe
- optimal growth at 37 degrees C
- needs high levels of CO2 to grow


Agrobacterium tumefaciens - correct answer ✔- rod shape
-motile(flagella all over)
- plant pathogen(wide host range)

,- gram negative
- aerobic
- biofilm former
- optimal growth at 28 degrees C


Francisella tularensis - correct answer ✔- no flagella
- causes tularemia(rabbit fever)
- transferred to humans only through animal or insect
- tier 1 select agent: whiner aerosolized, becomes most danger to humans
- gram negative
- coccobacillus
- aerobic
- non spore forming
optimal growth at 37 degrees C


Pectobacterium carotovorum - correct answer ✔- one of the most destructive
plant pathogen
- opportunistic pathogen
- motile(flagella all over)
- gram negative
- facultative anaerobe
- rod shaped
- optimal growth 20-25 degrees C


Bacterial cell structure - correct answer ✔- ribosomes, cell wall, plasma
membrane, chromosome, inclusion
- capsule, flagellum and fimbriae is not present in all

, cell wall morphology - correct answer ✔-peptidoglycan (murrein)
-2 alternating sugars(NAG and NAM)
- penta/tetra peptide side chains D and L amino acid(only come off of NAM
never NAG


effect of lysozyme on cell wall - correct answer ✔-breaks the bond between
NAG and NAM(hydrolyzes)
-cleaves backbone of peptidoglycan


effect of lysostaphin on cell wall - correct answer ✔targets bonds in
interbridge between gly


effect of B lactic antibiotics - correct answer ✔-efflux pumps
-mutations in pore proteins(gram negative)
- beta lactamases(destroy beta lactam ring structure)


how penicillin and augmentin works - correct answer ✔look at slide 211


how vancomycin works - correct answer ✔"drug of last resort"
bind to DALA, prevents cross linking


peptidoglycan structure - correct answer ✔meshlike polymer of identical
subunits forming long strands


gram negative cell envelope - correct answer ✔-peptide crosslink
-a. varying width periplasmic space

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