問題詳情

28. In bacteria, there are 61 mRNA codons that specify an amino acid, but only 45tRNAs. Which of the following statements explains this fact?
(A) Some tRNAs have anticodons that recognize four or more different codons.
(B) The rules for base pairing between the third base of a codon and tRNA are flexible.
(C) Many codons are never used, so the tRNAs that recognize them are dispensable.
(D) The DNA codes for all 61 tRNAs, but some are then destroyed.

參考答案

答案:[無官方正解]
難度:計算中-1
書單:沒有書單,新增

用户評論

【用戶】草薙素子

【年級】小二上

【評論內容】(A) 至少兩種就夠了(B) 此現象稱 Wobble(搖擺):mRNA與tRNA 接合的第三個密碼子不像轉錄時嚴格 ex. (tRNA上的)U正常接A,但也可接G;G可接C或U。

【用戶】草薙素子

【年級】小二上

【評論內容】(A) 至少兩種就夠了(B) 此現象稱 Wobble(搖擺):mRNA與tRNA 接合的第三個密碼子不像轉錄時嚴格 ex. (tRNA上的)U正常接A,但也可接G;G可接C或U。