SAT单科资料-生物-Biology-EM-模拟测试题与详解-第一套.pdf

BiologyE/MSampleTest1

WithAnswersandAnalysis

Directions:Eachquestionorincompletestatementisfollowedbyfive

possibleanswersorcompletions.ForbothBiology-EandBiology-M,select

theonechoicethatisthebestanswerandfillinthecorrespondingspaceon

theanswersheet.

1.Sexuallyreproducingorganismsshowgreatervariationthanasexually

reproducingonesbecause

(A)theyexhibitfewermutations

(B)theyexhibitagreatermutationrate

(C)asexuallyreproducingorganismsdonothaveinternalmembranes

(D)theirallelesrecombine

(E)theyarelarger

2.Severalspeciesofrhododendronaregrowinginthesamearea.Allof

theplantsarecapableofhybridization,butnoneeverdobecausesome

oftheplantsproducepolleninearlyJunewhileothersproducepollen

inlateJune.Thisbestdescribesanevolutionaryprocessknownas

(A)survivalofthefittest

(B)overpopulation

(C)reproductiveisolation

(D)artificialselection

(E)stabilizingselection

3.AllofthefollowingcontributetovariationinapopulationEXCEPT

(A)mutation

(B)isolation

(C)sexualreproduction

(D)conjugation

(E)geneticdrift

4.Oxygenreleasedbyplantscomesfrom

(A)air

(B)carbondioxide

(C)glucose

(D)chlorophyll

(E)water

5.AllofthefollowingaremammalsEXCEPT

(A)tiger

(B)ape

(C)kangaroo

(D)bluejay

(E)duck-billedplatypus

6.Whichofthefollowingisadensity-independentfactor?

(A)Disease

(B)Famine

(C)Floods

(D)Predation

(E)Increaseintoxinsintheenvironment

7.Agenepoolinapopulationofjackrabbitsinafieldremainedconstant

formanygenerations.Themostprobablereasonforthisstablegene

poolisthat

(A)nomigrationoccurredinalargepopula