Week 4. Quiz 4 - quiz 4 PDF

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9/27/2018

Week 4. Quiz 4 : Fall 2018 - BIOL-385-003 / MICR-385-003

Week4.Quiz4 Due Sep28at11:59pm Points 15 Questions 13 Available Sep24at8amSep28at11:59pm5days TimeLimit None

AemptHistory LATEST

Attempt

Time

Score

Attempt1

25minutes

8outof15*

*Somequestionsnotyetgraded

áCorrectanswerswillbeavailableSep29at12amOct3at12am. Scoreforthisquiz:8outof15* SubmittedSep27at5:32pm Thisattempttook25minutes.

Question1

1/1pts

Putthefollowingstepsofbacterialreplicationinthecorrectorder,starting fromaparentcell. 1.Cellelongation 2.Septumformation 3.Chromosomereplication 4.Separationofdaughtercells  

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Week 4. Quiz 4 : Fall 2018 - BIOL-385-003 / MICR-385-003

3,1,2,4

Question2

1/1pts

Whatwouldhappeniftheseptumdidnotformduringbinaryfission?   

Theparentcellwouldnowhavetwocopiesofthechromosome

Question3

1/1pts

6.Thirtysixcoloniesgrewinnutrientagarfrom0.1mlofsamplewithdrawn fromasolutiondilutedto103inastandardplatecountprocedure.How manycellswereintheoriginalsample? 

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Week 4. Quiz 4 : Fall 2018 - BIOL-385-003 / MICR-385-003

360,000

Incorrect

0/1pts

Question4 Whichofthefollowingisthebestdefinitionofgenerationtime? 

Thetimeittakesfornucleardivision.

Question5

Notyetgraded/3pts

Discusshowgenerationtimeisderivedfromagrowthcurve(3pts)  YourAnswer: Generationtimecanbedefinedasthelengthoftimerequiredfora populationtodoubleinsize.Whenagrowthmediumisinoculatedwithonlya

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Week 4. Quiz 4 : Fall 2018 - BIOL-385-003 / MICR-385-003

fewbacteria,thepopulationcanbecountedandplottedoveraperiodof time.Thecountofthebacteriaisknownasthelogarithmofthenumberof thebacteria.Thisplottedinformationisavisualrepresentationknownasa growthcurve.Atypicalgrowthcurveshowsalag,log,stationary,anddeath phase.

Incorrect

Question6

0/1pts

Ifyoustartoutwithapopulationdensityof200CFU/mlofabacteriumthat dividesevery20minutes,whatwillthepopulationdensitybeattheendof twohours,assumingthecellsareinthelogphaseofgrowth.  

12800CFU/ml

Incorrect

Question7

0/1pts

Whichsectionshowsagrowthphasewherethenumberofcellsdyingequals thenumberofcellsdividing?

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Week 4. Quiz 4 : Fall 2018 - BIOL-385-003 / MICR-385-003



C

Incorrect

Question8

0/1pts

Starvationproteinsareproducedbyacultureduringwhichofthefollowing partsofthegrowthcurve?  

Deathphase

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Question9

1/1pts

Belowarethreedifferentculturemedia.Usethemtoanswerthefollowing question.Onwhichmediumwouldanchemoorganotrophicheterotroph grow? MediumAMediumBMediumC Tributyrin(alipid)GlucoseNa2 HPO4 Na2PO4PeptoneKH2 PO4 KH2PO4(NH4 )2 SO4 MgSO4 MgSO4KH2 PO2 CaCl2 (NH4)2 SO4 Na2 HPO4 NaHCO3

MediumAandMediumB

Question10

1/1pts

Belowarethreedifferentculturemedia.Usethemtoanswerthefollowing question.Whichofthesemedia,ifanyarechemicallydefined? MediumAMediumBMediumC

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Week 4. Quiz 4 : Fall 2018 - BIOL-385-003 / MICR-385-003

Tributyrin(alipid)GlucoseNa2 HPO4 Na2PO4PeptoneKH2 PO4 KH2PO4(NH4 )2 SO4 MgSO4 MgSO4KH2 PO2 CaCl2 (NH4)2 SO4 Na2 HPO4 NaHCO3 

MediumAandMediumC

Question11

1/1pts

Ifyouaredesigninganexperimentinvolvingachemolithotrophicautotroph; whichofthefollowingwouldbemostessentialtomaintaininggrowthofthe organism?   

asourceofreducedinorganiccompoundsuchasNH4

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Question12

1/1pts

Additionofsalttoaculturemediumonlyallowsthesalttolerantbacteriato grow.Thisisanexampleofa  

Selectivemedia.

Question13

1/1pts

13.Acultureofbacteriaproduces5generationsin2hours.Whatisthe generationtimeforthisbacteriumunderthoseconditions.  

24minutes

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Week 4. Quiz 4 : Fall 2018 - BIOL-385-003 / MICR-385-003

QuizScore:8outof15

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