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DNA VE RNA YAPISI
Kalıtsal bilgiyi taşıyan molekül 4 önemli özelliğe sahip olmalıdır.
+Kendini eşleme-replikasyon
+bilgi depolama
+bilgiyi ifade etme
+Mutasyonle çeşitlenme-varyasyon

Nukleotid=Azotlu baz+ pentoz şekeri+fosfat grubu

Canlı hücrelerde b-dna biçimi baskındır
Z-DNA sola dönümlü

RNA'nın özellikleri
+DNA taşıdığı yaşam şifrelerini RNA'ya aktararak emirlerini sitoplazmaya yollar.
+Hücredeki oran rRNA>tRNA>mRNA

Haberci RNA = mRNA
+Nukleusta kromozomun aktif ökromatin bölgesinde sentezlenir
+Protein sentezi için kalıp görevi görür.
+Üçlü baz gruplarına kodon denir.
+En kısa ömürlü olanıdır.

Transfer RNA = tRNA
+Sekonder yapıları yonca yaprağı şeklinde olan RNA'dır.
+Protein sentezine girecek aaleri sentez yerine taşır.
+Kolay çözünür.
+Antikodon

Ribozomal RNA = rRNA
+Ribozomların yapısındaki RNA'dır
+Svedberg ünitesi olarak belli sedimantasyon katsayılarına sahip olan çeşitli rRNA'lar kombine olarak ribozomları oluştururlar.
+Ribozomların yapısında %60rRNA bulunur.








     
 
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