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Q:l Whenl performingl al quadrantl streak,l thel samplel isl spreadl acrossl thel platel inl suchl al wayl tol forml what?
Answer:
Al dilutionl gradient.
Q:l Al dilutionl gradientl isl formedl whenl carryingl outl whatl generalizel
platingl strategy?
Answer:
Phase-Dilutionl streak
Q:l Inl whatl phasel ofl dilutionl streakl wouldl youl expectl tol findl thel lowestl concentrationl ofl bacteria.l P2l orl P4?
Answer:
P4.Thel phasesl concentrationl rankl froml P1l beingl thel highest,l thenl P2,l P3,l andl P4.
BIOLl271l /l BIOL271l Finall Exam:l
(Latestl 2026/l 2027l Update)l 100%l Verifiedl Questionsl &l Answersl |l Gradel A
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Q:l Truel orl False.l Whenl performingl al dilutionl streakl al newl (orl sterilized)l loopl isl notl requiredl forl eachl phasel asl longl asl thel bacteriall culturel isl pure.
Answer:
False
Q:l Thel numberl ofl phasesl (3l vs.l 4)l and/orl thel numberl ofl timesl al loopl passesl throughl al previousl phasel (oncel vs.l multiple)l isl acceptablel providedl whatl happens?
Answer:
Thel resultingl gradientl hasl growthl ofl thel individuall coloniesl inl it
Q:l Truel orl False.l Tol restrictl thel growthl ofl al pathogenicl microbel al
researcherl mightl decreasel anl incubatorl froml 37°Cl tol 25°C.
Answer:
True
Q:l Whenl givenl anl unknownl bacteriall samplel thel firstl stepl isl tol expandl thel currentl bacteriall population.l Whichl forml ofl medial bestl suitesl thisl need?l Why?
1.l MSAl agar 2 / 4
2.l LBl media 3.l MacConkeyl agar 4.l Columbial CNAl agar
Answer:
LBl media.l Alll otherl optionsl arel formsl ofl selectivel medial whichl meansl theyl wouldl potentiallyl inhibitl thel growthl ofl thel unknownl sample.
Q:l Truel orl False.l Onlyl directlyl ingestingl thel pre-formedl clostridiuml toxinl (neitherl thel bacterial norl itsl spores)l willl causel diseasel inl adults.
Answer:
True
Q:l Truel orl False.l Therel arel currentlyl nol curesl forl tetanus.
Answer:
True
Q:l Thel alpha-toxinl perfringolysinl isl associatedl withl whichl medicall
conditionl causedl byl Gram-positivel anaerobicl bacteria?Tetanus Leprosy Botulism Gasl gangrene
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Answer:
Gasl gangrene
Q:l Truel orl False.l Pneumonicl plaguel isl oftenl characterizedl byl painfullyl swollenl lymphl nodes.
Answer:
False
Q:l Truel orl False.l Bubonicl plaguel isl oftenl characterizedl byl painfullyl
swollenl lymphl nodes.
Answer:
True
Q:l Identifyl thel followingl disease:l (imagel ofl handl withl largel blackl openl sorel onl basel ofl thumb) Gasl gangrene Frostl bite Anthrax Tetanus
Answer:
Anthrax
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