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MMG 301 Exam 3 Questions with Correct Answers Latest Update 2025/2026

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MMG 301 Exam 3 Questions with Correct Answers Latest Update 2025/2026 Transpeptidase, the enzyme that cross-links peptidoglycan in bacterial cell walls - Answers β-lactam target Weakens cell wall → lysis due to osmotic pressure - Answers Effect of β-lactams on bacteria β-lactam ring - Answers Structure defining all β-lactams Enzyme that cleaves β-lactam rings → antibiotic inactivation - Answers NDM-1 function Enzymatic degradation of antibiotic - Answers Resistance mechanism of NDM-1 Encodes PBP2a, a transpeptidase that does not bind β-lactams - Answers MecA function High MIC value - Answers How to identify resistance on an E-test Low MIC value - Answers How to identify sensitivity on an E-test Measures DNA amount in real time through amplification - Answers qPCR purpose Growth-independent, does not require live bacteria - Answers qPCR dependency Low starting DNA amount - Answers High CT value meaning Number of microbes that kill 50% of hosts - Answers LD50 definition Number of microbes that infect 50% of hosts - Answers ID50 definition More virulence → lower LD50 - Answers Effect of virulence on LD50 More virulence → lower ID50 - Answers Effect of virulence on ID50 Breaks down collagen to aid tissue invasion - Answers Collagenase function Compares bacterial DNA by separating large fragments - Answers PFGE purpose Determines if isolates are the same strain - Answers PFGE in outbreaks Ingest bacteria → they grow in the body - Answers Food infection Ingest pre-formed toxin - Answers Food poisoning Nutrient deprivation or extreme stress - Answers Trigger for sporulation Stabilize spore DNA - Answers SASPs function Provides heat resistance to spores - Answers Dipicolinic acid role Molecule recognized by immune system - Answers Antigen definition

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MMG 301 Exam 3 Questions with Correct Answers Latest Update 2025/2026

Transpeptidase, the enzyme that cross-links peptidoglycan in bacterial cell walls - Answers β-
lactam target

Weakens cell wall → lysis due to osmotic pressure - Answers Effect of β-lactams on bacteria

β-lactam ring - Answers Structure defining all β-lactams

Enzyme that cleaves β-lactam rings → antibiotic inactivation - Answers NDM-1 function

Enzymatic degradation of antibiotic - Answers Resistance mechanism of NDM-1

Encodes PBP2a, a transpeptidase that does not bind β-lactams - Answers MecA function

High MIC value - Answers How to identify resistance on an E-test

Low MIC value - Answers How to identify sensitivity on an E-test

Measures DNA amount in real time through amplification - Answers qPCR purpose

Growth-independent, does not require live bacteria - Answers qPCR dependency

Low starting DNA amount - Answers High CT value meaning

Number of microbes that kill 50% of hosts - Answers LD50 definition

Number of microbes that infect 50% of hosts - Answers ID50 definition

More virulence → lower LD50 - Answers Effect of virulence on LD50

More virulence → lower ID50 - Answers Effect of virulence on ID50

Breaks down collagen to aid tissue invasion - Answers Collagenase function

Compares bacterial DNA by separating large fragments - Answers PFGE purpose

Determines if isolates are the same strain - Answers PFGE in outbreaks

Ingest bacteria → they grow in the body - Answers Food infection

Ingest pre-formed toxin - Answers Food poisoning

Nutrient deprivation or extreme stress - Answers Trigger for sporulation

Stabilize spore DNA - Answers SASPs function

Provides heat resistance to spores - Answers Dipicolinic acid role

Molecule recognized by immune system - Answers Antigen definition

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