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Bilgi Bankası - Mikrobiyoloji, Sitoloji, Genetik, Zooloji, Botanik

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>A - B - C- Ç - D - E - F - G - H - I - İ - J - K - L - M - N - O - Ö - P - R - S - Ş - T - U - Ü - V - W - X - Y - Z<

Mesajcı RNA (mRNA)

Mesajcı RNA (mRNA)

 mRNA transkripsiyon sonucu oluşan, bir dizi nükleotid içeren ve üretilecek proteine kalıp görevi gören birimdir. DNA'nın helikaz enzimi tarafından açılması ile RNA Polimeraz enzimi, açılmış 3'-5' yönündeki DNA zincirini okuyarak mRNA'yı üretir. DNA, tRNA'nın uyum göstereceği şekilde kodonlar (triplet - 3'lü nükleotid dizisi) içerir. Ve her kodon 1 aminoasiti ifade eder.

Ökaryotlarda (Mayalar hariç) üretilen mRNA'lar intron ve eksonlar içerir. Prokaryotlarda bu durum gözlenmez.

Ökaryotlardaki mRNA ilk üretildiğinde intron ve eksonlar içerir. Bu haldeki mRNA'lara Pre-mRNA adı verilir. Belli enzimlerle çıkartılan intronlardan sonra sadece ekson içeren mRNA oluşur ve bu haldeki mRNA ya Olgun mRNA adı verilir.

mRNA'lar hazır olduklarında ribozomlara bağlanarak protein üretimine yön verirler.

Resim: Resimde dik duran turuncu renkli kısım DNA. Mavi ve yeşil renklerden oluşan büyük birim RNA Polimeraz. Sol kısımdan çıkan kırmızı renkli birim ise mRNA'dır.

Yorum
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10/09/2010 09:59
Yusuf,eskidin artık kardaşım.Başka Ahmetler,Veliler,H
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10/09/2010 09:50
Artık yabancı büyük üniversiteler bilimde mikro boyuttan,makro boyuta dönüyormuş.Doğru mu Yusuf?Hatta bunun için dünya genelinde projeler yürütüyorlarmış.Do
ğru yani.

07/09/2010 12:25
site çok güzel de ''YUSUF'' adlı kullanıcıdan başka keşke ilgilenen olsa ben açıkçası böyle bir siteye üye olduğumu bile unutmuştum

01/09/2010 20:26
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01/09/2010 11:01
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11/08/2010 12:24
adminin bu site için çalıştığını düşünmüyorum zaten..referanduma
az kaldı daha önemli onun için Smilesiyaset daha önemli nedense Pfft

10/08/2010 14:55
ben siteye uğruyorum admin bey Pfft

26/03/2010 12:52
bir senedir aynı haberler...bir site yapıyorsunuz adam gibi ilgilenin bari

16/01/2010 19:43
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12/01/2010 22:30
ya neden kımse ılgılenmıyo sorularımla.Anlıyo
rum finallerınız basladı ama Yusuf barı sen cevapla.

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