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    RNA dünyası hipotezi

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    Yazeka

    Arama sonuçlarına dayanarak oluşturuldu

    RNA dünyası hipotezi, yaşamın kökenini açıklayan ve RNA'nın hem genetik bilgiyi depolayıp hem de kimyasal tepkimeleri katalizleyebildiği erken bir dönemi öne süren teoridir. Bu hipoteze göre, DNA ve proteinler evrimleşmeden önce RNA, yaşamın temel yapıtaşı olarak işlev görmüştür.

    Ribozimler adı verilen RNA molekülleri, enzim benzeri katalizör görevi görerek kendi kendini çoğaltma ve metabolik süreçleri yönetme yeteneğine sahiptir. Ribozomun yapısında yer alan RNA'nın protein sentezindeki rolü, bu hipotezi destekleyen önemli kanıtlardan biridir.

    Günümüzde DNA ve proteinlerin baskın olduğu sistemlerde RNA'nın rolü sınırlı olsa da, yaşamın başlangıcındaki kritik işlevi bilim insanları tarafından kabul görmektedir.

    Daha fazla
    sciencealert.com
    vedantu.com
    bilimvegelecek.com.tr
    unicourse.co
    biologyonline.com

    İlgili gündem

    DNA ve RNA arasındaki farklar nelerdir diye merak eden biri, aslında yaşamın temel moleküllerinin işleyişine kapı aralamış olur. Canlıların kalıtsal bilgisini taşıyan DNA ile protein sentezinde görev alan RNA, biyolojinin en temel iki molekülüdür. Her ikisi de nükleik asit sınıfına girse de yapı, görev ve işleyiş açısından aralarında önemli farklar bulunur. İşte bu yüzden DNA ile RNA’nın ortak özellikleri ve farkları, canlıların nasıl işlediğini anlamak açısından kritik bir adımdır.
    sabah.com.tr28 Haziran
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    Yazeka hakkındatr.wikipedia.org
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