問題詳情
33. Which of the following statements correctly describes one of the characteristics ofalternative splicing in vertebrate genomes?
(A) Vertebrate genomes can produce more than one polypeptide from a single gene.
(B) Vertebrate genomes can produce only one polypeptide from a single gene.
(C) Vertebrate genomes are always smaller than other organisms.
(D) Alternative splicing leaves introns in vertebrate genes after they are transcribed.
參考答案
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【草薙素子】評論
(A)(B) alternative RNA splicing(選擇性剪接):一個基因會變成何種多肽,是根據剪接時,哪一段會被當 exons 留下而決定。因此可能性將不只一種。(C) 昆士蘭肺魚(Australian lungfish)是已知基因體最大的動物(43-billion-base-pair),這種脊椎動物的鹼基對數量約是人類的14倍。(D) 只有 exons 不會被剪掉。introns 會先被剪掉 ,留下 exons 離開細胞核參與接下來的轉譯。