Biology 101 Exam 3 Questions and Answers 2025

Biology 101 Exam 3 Questions and
Answers 2025
Chromosomesaconsistaofa______A&A__________.A-ACORRECTAANSWERSA-
DNAA&aprotein
Chromosomesareplicatea(priora/Aafter)acelladivision.A-ACORRECTAANSWERSA-prior
Doesadnaavaryaamongaspecies?A-ACORRECTAANSWERSA-Yes
Fredrickagriffithafiguredaoutatheasourceaofaheredityabyastudyinga___________.A-
ACORRECTAANSWERSA-bacteria

Heatakilledaremainsaofatheapathogenicastrainawereamixedawithalivingacellsaofanon-
pathogenicastrainaandasomeaofathealivingacellsabecamea__________.A-
ACORRECTAANSWERSA-pathogenic

Oneastrainaproducedaaaheritableachangeainatheaotherastraina-ACORRECTAANSWERSA-
transformingaprinciple
Transformingaprincipleawasadoneabya___________A(lastaname).A-
ACORRECTAANSWERSA-Griffith

Avery,amacleodaandamccartyadidaanaexperimentawhereatheyaremoveatheaprotein:adidatheatra
nsformationastillaoccur?A-ACORRECTAANSWERSA-Yes
Avery,amacleodaandamccartyadidaanaexperimentawhereatheyadestroyedadna:adidatheatransfo
rmationastillaoccur?A-ACORRECTAANSWERSA-No
Avery,amacleodaandamccartyathroughaexperimentationarealizedathatadnaawasathea_______
_____A______________.A-ACORRECTAANSWERSA-transformationamaterial
Aavirusathatainfectsabacteria,abyainjectingarnaaoradnaathatabecomeapartaofatheabacteria'sadna.
A-ACORRECTAANSWERSA-Bacteriophages

Alfredahersheyaandamarthaachaseastainedatheaproteinacoataofatheavirusanotafoundainabacteri
uma-
athusamakingatheanewaviralaparticlesainsideatheacella(ableatoabeafounda/anotaableatoabeafound)

.A-ACORRECTAANSWERSA-notaableatoabeafound
Alfredahersheyaandamarthaachase'sasecondaexperimentawasawhereatheyastainedatheadnaao
fatheavirusainatheabacteriuma-
athusamakingatheanewaviralaparticlesainsideatheacella(ableatoabeafounda/anotaableatoabeafound)

.A-ACORRECTAANSWERSA-ableatoabeafound
Erwinachargaffafoundathatainanitrogenousabasesatheaamountaofaaa=A____,aandatheaamountao
faca=A_____.A-ACORRECTAANSWERSA-TAG
Dnaaisainatheashapeaofaaa_______A________.A-ACORRECTAANSWERSA-doubleahelix
Dnaahasaaa(uniforma/Aun-uniform)Adiameter.A-ACORRECTAANSWERSA-uniform
Theabackbonesaofadnaathataareaequidistantathroughoutatheahelixaareamadeaofa________A__
_____.A-ACORRECTAANSWERSA-sugaraphosphates
Dnaaisa(parallelaoraanti-parallel)?A-ACORRECTAANSWERSA-anti-parallel
Adenineapairsawitha-ACORRECTAANSWERSA-Thymine
Cytosineapairsawitha-ACORRECTAANSWERSA-Guanine
Pairingaisacalleda___________abaseapairinga-ACORRECTAANSWERSA-complementary

, Dnaaisa:A______Ahelix,A______-handed,A_____-parallel,ahasa__________abaseapairing.A-
ACORRECTAANSWERSA-double,Aright,Aanti,Acomplementary

Adenineapairsawithathymineabya___A(#)ahydrogenabonds.A-ACORRECTAANSWERSA-2
Cytosineapairsawithaguanineabya____(#)ahydrogenabonds.A-ACORRECTAANSWERSA-3
Replicationaisaexplainedabya_______apairinga-ACORRECTAANSWERSA-base
Eachastrandaisaaatemplateaforatheaotherabecauseaofacomplementaryabaseapairinga-
atrueaorafalse?A-ACORRECTAANSWERSA-true

Semi-conservativeareplicationaisawhen:ahydrogenabondsaarea________,astrandsa_____-
windaanda________,anewabasesaobserveabaseapairingarules,aresultaisa____A(#)aidenticalaco
pies.A-ACORRECTAANSWERSA-broken,Aun-windaandaseperate,A2
Inasemiconservativeareplicationasaysathataeachaofatheaoldastrandamakesaaanewahalfaandaaft
eraonearoundaofareplicationathereaisaoneaoldachainaandaoneanewachain.atrueaorafalse?A-
ACORRECTAANSWERSA-True

Strandaunwinds/aopensaandareplicationabeginsaataanaoriginaofareplication.athisaisacalled:A-
ACORRECTAANSWERSA-Initiation

Newastrandsaofadnaaareasynthesizedabyadnaapolymerase.athisaisacalled:A-
ACORRECTAANSWERSA-Elongation

Endingadnaareplication,ajoiningapiecesaandaproofreading.athisaisacalled:A-
ACORRECTAANSWERSA-Termination

Whataisatheanameaofatheamainaenzymeainvolvedainareplication?A-ACORRECTAANSWERSA-
dnaapolymerase
Dnaapolymeraseamayainsertaincorrectabasesa-atrueaorafalsea-ACORRECTAANSWERSA-True
Whatacorrectsatheseamistakesa(incorrectabasesamatched)?A-ACORRECTAANSWERSA-
proofreadingaenzymes
Threeastepsaofadnaarepaira:A"thea3ar's"A-ACORRECTAANSWERSA-
Recognize,aremove,areplace
Incorrectabase-pairingsathataareanotafixedacausea_______.A-ACORRECTAANSWERSA-
mutations
Allanewaallelesamadeafromaincorrectabase-pairingsaareaharmful.atrueaorafalsea-
ACORRECTAANSWERSA-False

Anyachangeainatheanitrogenousabaseasequenceaofadnaaisaaa___________.A-
ACORRECTAANSWERSA-mutation

Mutationsawithinaaageneacanachangeaaabasea-atrueaorafalsea-ACORRECTAANSWERSA-True
Removeaoraaddingaaabaseachangesatheareadingaframeaofatheageneticamessageaandamanya
aminoaacidsachange,athisaisaalmostaalwaysaveryadamagingaandacalleda-
ACORRECTAANSWERSA-Frame-shiftamutations

Exposureatoahighalevelsaofauvaradiationaforaextendedaperiodsaofatimeaoftenaresultsainacellade
athawhichaisacalleda-ACORRECTAANSWERSA-apoptosis
Ifaapoptosisafailsathenacellsamayabecomea____________.A-ACORRECTAANSWERSA-
cancerous
Basesaareahowadnaaholdsainformationa-atrueaorafalsea-ACORRECTAANSWERSA-True
Allelesaareamadeaupaofadifferentadnaasequencesa-atrueaorafalsea-ACORRECTAANSWERSA-
True
Baseasequenceastoresaandaencodesahugeaamountsaofainformationa-
athisaisacalleda_________.A-ACORRECTAANSWERSA-genotype