Hofstra Living environment Dr Rob

With Sammy and Henry and the gang at Hofstra

1. Directions(31–43):Foreachstatementorquestion,recordontheseparateanswersheetthe
numberofthewordorexpressionthat,ofthosegiven,bestcompletesthestatementoranswers
thequestion.
31AscientistanalyzedasegmentofDNAfromahumanchromosomeandfoundthatthe
percentageofthyminemolecularbases(T)was35%.Whichrowinthechartbelowcontainsthe
correctpercentagesoftheothermolecularbasesintheDNAsegment?
.32ThegraphbelowshowschangesinthepopulationsofharesandlynxinaCanadian
ecosystem.
.
.

2. Whichstatementabouttheharesandlynxcanbesupportedwithinformation
fromthegraph?
(1)Thehareisthepredatorofthelynxbecauseitisalargeranimal.
(2)Thelynxpopulationbeginstodropaftertheharepopulationdrops.
(3)Bothpopulationsgothroughcyclesduetothesuccessionofplantspecies.
(4)Bothpopulationshaveacarryingcapacityof3000persquarekilometer
Answeris(2)fromdatabase
Answer:
A)predationisthedominantfactoraffectingpreypopulationcycling
Explanation:
Predationisatypeofinteractionbetweenspecieswhereonespeciescalled
‘predator’usesanotherspecies,the‘prey’,asasourceoffood.Withinan
ecosystem,thenumberofpredatorsandpreymayvaryovertimeincyclesof
time(inthesecases,thepopulationcyclesofbothspeciesarecloselylinked).
Inconsequence,predationisadensity-dependentfactor.Inthecaseof
thesnowshoehareanditspredator,thelynx,whenthenumberofpredatorsis
toohigh,thenumberofpreydrasticallydecreases.Subsequently,thisleadsto
thedecreaseofpredatorsthatleavetheirhomerange(theydon’thave
enoughfoodtosurvive),therebythesnowshoeharepopulationincreases
againuntilthepeakofthepopulationcycle(carryingcapacity),andso
successively.
35Whichprocessperformedbyorganismsproducesoxygenfortheaquatic
ecosystem?(1)respiration(3)activetransport(2)replication(4)autotrophic
nutrition

3. 33Thediagrambelowrepresentsacellinthehumanbody
Whichstatementconcerningthestructureswithinthiscellisaccurate?
(1)Structure1isachloroplastthatcarriesoutphotosynthesis.
(2)Structure2isavacuolethatcontainsDNA.
(3)Structure3isamitochondrion,whererespirationtakesplace.
(4)Structure4isthecellmembrane,whichprovidesrigidsupportforthecell
Answeris(3)--confirmed

4. Baseyouranswerstoquestions34and35onthedatatablebelowandon
yourknowledgeofbiology.Thetablebelowindicatestheamountofoxygen
presentatvariouswatertemperaturesinapond.
..
Anaquaticecosystemexperiencesanincreaseintemperature.Whichrowin
thechartbelowshowstheeffectofthisincreasedtemperatureonthe
availableoxygenandecosystem?
…
..

5. Answer34-3
35Whichprocessperformedbyorganismsproduces
oxygenfortheaquaticecosystem?
(1)respiration
(3)activetransport
(2)replication
(4)autotrophicnutrition
Answer35-4
Speciesdiversityinaquaticecosystemsissignificantlyaffectedbythe
increasedwatertemperature.Thisisbecausewarmwaterholdsless
dissolvedoxygenthancoolwater,andmaynotcontainenoughdissolved
oxygenforthesurvivalofdifferentspeciesofaquaticlife.
Whatisanecosystem?
Anecosystemmaybedefinedasatypeofplaceoranareawheremembers
ofdifferentspecieslivetogetherandinteractwithoneanotherforthe
purposeoffood,shelter,space,matingpartner,andotherresources.
Thesolubilityofoxygenandothergaseswilldecreaseastemperature
increases.Thismeansthatcolderlakesandstreamscanholdmore
dissolvedoxygenthanwarmerwaters.Ifwateristoowarm,itwillnothold
enoughoxygenforaquaticorganismstosurvive.
Somecompoundsarealsomoretoxictoaquaticlifeathighertemperatures.
So,warmstreamwateriscanaffecttheaquaticlifeinthestream.

6. TolearnmoreaboutSpeciesdiversity,refertothelink:
brainly.com/question/1446827
Answer34-3
Answer35-4
.
Baseyouranswerstoquestions36and37onthediagrambelowandonyour
knowledgeofbiology.Thediagramrepresentsafoodwebillustratingsome
relationshipsinatidalmarshecosystem.

7. 36Examplesofautotrophsinthisfoodwebare
(1)killerwhalesandgrasses
(2)sedgesandbulrushes
(3)mosquitoesandgrasshoppers
(4)snailsandseals
Answerin(2)--(2)sedgesandbulrushes
Explanation:
Afoodchainrepresentsthelinearpathwayoftheflowofmatterandenergyin
theecosystemthroughconsumptionoforganismasfood.
Thefoodchainvariesfromecosystemtoecosystemastheorganismare
differentinthedifferentecosystembutthetrophiclevelremainsthe
samethatisthebasaltrophiclevelmustbeproducers.
Inthegivenquestion,theaquaticecosystemfoodchainbeginswiththe
producerslikeseaweedwhichformsthebasaltrophiclevel.The
seaweedscanbeconsumedbythecrab(primaryconsumers)andthe
crabcanbeeatenbythesquid(secondaryconsumer).Thesquidcanbe
eatenbythesealandthesealcanbeeatenbythewhale.
37Inadditiontograsshoppers,herringmayalsogetenergyfrom
(1)algae
(2)baldeagles
(3)snails
(4)voles
Answeris(1)--foundbyreadingchart

8. 38Eachspecieslistedisapredator.Ifthepreyorganismsthateachpredator
consumesweretested,theywouldmostlikelycontain
(1)thesameamountofmercuryasthepredatorspecies
(2)lessmercurythanthepredatorspecies
(3)moremercurythanthepredatorspecies
(4)nomercury,sincethepredatorsprobablygetitfromthepollutedwater
39Whichstatementisbestsupportedbythedatainthechart?
.
(1)AnyfishcaughtintheGulfofMexicowouldhavelowlevelsofmercury.
(2)Eatingcatfishorhaddockwouldbemostlikelytocausedeadlymercury
poisoning.
(3)Spinylobstersmayhavemoreorlessmercurythanindicatedbecause
onlyafewweresampled.(

9. 4)Tilefisharethemostnutritiousofallthespecieslisted.
Answeris(3)
40Thediagrambelowrepresentsalaboratoryprocess.
.
Answeris(1)
41Thehumanbodyhasmanycellsthataredeepinsidethebody.Forthis
reason,thehumanbodyrequires
(1)atransportsystemandotherorgans
(2)carbondioxidefromtheair
(3)thesynthesisofmanyinorganiccompounds
(4)thebreakdownofglucosebythedigestivesystem
Answeris(1)

10. Baseyouranswerstoquestions42and43ontheinformationbelowandon
yourknowledgeofbiology.
BirdFluResearchersarenotsurewhentheH7N9virus,referredtoasbirdflu,
hittheChinapoultrymarkets.InFebruaryof2012,theviruswasfoundto
havespreadfrombirdstohumans.Allcasesresultedfromdirectcontactwith
infectedpoultry.
Thebirdflucancausesevererespiratoryillnessinhumans.Sincefluviruses
constantlymutate,itwouldbedifficulttodevelopavaccineaheadoftime.
Scientistsareworriedthattheviruscouldspreadeasilyamongpeople,
causingaworldwideoutbreakofthedisease.
42Basedontheinformation,onedangerofthenewBirdFluH7N9strainis
thatit
(1)causesdeathinover75%oftheindividualswhobecomeinfected
(2)istransferredtohumansthroughconsumingcookedpoultry
(3)canspreadfromhumanstobirds,suchascrowsandpigeons
(4)mutatesrapidly,makingithardtoproduceaneffectivevaccine
Answeris(4)

11. 43ThefactthattheH7N9virushasonlyrecentlyinfectedhumanshelps
explainwhy
(1)itishighlytransmissiblethroughboththeairandwater
(2)itisfoundonlyintheU.S.
(3)humanshavelittleornoimmunitytothevirus
(4)thehumanpopulationhasformedantibodiesagainstthevirus
Answeris(3)
.