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Aratrmaclar, E. coli tarafndan tipik olarak tketilmeyen bir madde olan dk konsantrasyonda glikoz
ve yksek konsantrasyonda sitrat ieren bir byme ortamnda ayn E. coli bakteri poplasyonlarn byttler.
Binlerce nesil boyunca, bakteri enerji kayna olarak yalnzca glikoz kulland ve dk glikoz
konsantrasyonlar nedeniyle nispeten yava ve dk bir younlua ulat. Yaklak 30.000 nesil sonra, ok
daha yksek bir younlua doru hzla bymeye balayan bir poplasyon ortaya kt. Aratrmaclar,
bakterilerin sitrat bir enerji kayna olarak kullanma yeteneini gelitirdiini ve buna Cit+ adn verdiini
varsaydlar. Hipotezi test etmek iin aratrmaclar, yalnzca sitrat ieren bir byme ortamnda Cit+
bakterilerinin ve orijinal poplasyondan (Cit-) bakterilerin ayr poplasyonlarn byttler.
(a) Belirli bir poplasyonun evrimletiini gsterecek bir sonucu tanmlayn.
(b) Deneylerde llen baml deikeni belirleyin.
(c) Sadece sitrat ieren besiyerinde Cit+ ve Cit- bakterilerini rettiklerinde aratrmaclar tarafndan elde
edilen sonular tahmin edin.
(d) Aratrmaclarn Cit+ mutasyonunun bakterilerin uygunluunu artrdn iddia ettii fikrini desteklemek
iin bir neden salayn.

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Aratrmaclar E coli tarafndan tipik olarak tketilmeyen bir.pdf

  • 1. Aratrmaclar, E. coli tarafndan tipik olarak tketilmeyen bir madde olan dk konsantrasyonda glikoz ve yksek konsantrasyonda sitrat ieren bir byme ortamnda ayn E. coli bakteri poplasyonlarn byttler. Binlerce nesil boyunca, bakteri enerji kayna olarak yalnzca glikoz kulland ve dk glikoz konsantrasyonlar nedeniyle nispeten yava ve dk bir younlua ulat. Yaklak 30.000 nesil sonra, ok daha yksek bir younlua doru hzla bymeye balayan bir poplasyon ortaya kt. Aratrmaclar, bakterilerin sitrat bir enerji kayna olarak kullanma yeteneini gelitirdiini ve buna Cit+ adn verdiini varsaydlar. Hipotezi test etmek iin aratrmaclar, yalnzca sitrat ieren bir byme ortamnda Cit+ bakterilerinin ve orijinal poplasyondan (Cit-) bakterilerin ayr poplasyonlarn byttler. (a) Belirli bir poplasyonun evrimletiini gsterecek bir sonucu tanmlayn. (b) Deneylerde llen baml deikeni belirleyin. (c) Sadece sitrat ieren besiyerinde Cit+ ve Cit- bakterilerini rettiklerinde aratrmaclar tarafndan elde edilen sonular tahmin edin. (d) Aratrmaclarn Cit+ mutasyonunun bakterilerin uygunluunu artrdn iddia ettii fikrini desteklemek iin bir neden salayn.