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ÐÅʹºËÌǺËËá mRNA messenger ribonucleic acidDNA deoxyribonucleic acid. ËäÈ»mRNAÔÚËùÓÐϸ°ûÄÚÖ´ÐÐ×ÅÏàͬµÄ¹¦ÄÜ£¬¼´Í¨¹ýÈýÁª×ÓÃÜÂë·ÒëÉú³Éµ°°×ÖÊ£¬ÆäÉúÎïºÏ³ÉµÄ¾ßÌå¹ý³ÌºÍ³ÉÊìmRNAµÄ½á¹¹ÔÚԺ˺ÍÕæºËÉúÎïϸ°ûÄÚÊDz»Í¬µÄ¡£ °Ë¡¢µ°°×ÖʵÄÉúÎïºÏ³É ºËÌÇÌåÊǵ°°×Öʺϳɵij¡Ëù£¬mRNAÊǵ°°×ÖʺϳɵÄÄ£°å£¬tRNAÊÇÄ£°åÓë°±»ùËáÖ®¼äµÄ½ÓºÏÌå¡£´ËÍ⣬ÓÐ20ÖÖÒÔÉϵÄAA-tRNA¼°ºÏ³Éø¡¢10¶àÖÖÆðʼÒò×Ó¡¢ÑÓÉìÒò×Ó¼°ÖÕÖ¹Òò×Ó£¬30¶àÖÖtRNA¼°¸÷ÖÖrRNA¡¢mRNAºÍ100ÖÖÒÔÉÏ·Òëºó¼Ó¹¤Ã¸²ÎÓëµ°°×Öʺϳɺͼӹ¤¹ý³Ì¡£ µ°°×ÖʺϳÉÏûºÄÁËϸ°ûÖÐ90%×óÓÒÓÃÓÚÉúÎïºÏ³É·´Ó¦µÄÄÜÁ¿¡£Ï¸¾úϸ°ûÖеÄ2Íò¸öºËÌÇÌ壬10Íò¸öµ°°×ÖÊÒò×ÓºÍ20Íò¸ötRNAs Ô¼Õ¼´ó³¦¸Ë¾ú¸ÉÖصÄ35%¡£ Ôڴ󳦸˾úÖкϳÉÒ»¸ö100¸ö°±»ùËáµÄ¶àëÄÖ»Ðè5·ÖÖÓ¡£ 1.µ°°×ÖÊÉúÎïºÏ³ÉµÄÖ÷Òª²½Ö裺 ·ÒëµÄÆðʼ¡ª¡ªºËÌÇÌåÓëmRNA½áºÏ²¢Óë°±»ùõ£-tRNAÉú³ÉÆðʼ¸´ºÏÎï¡£ëÄÁ´µÄÑÓÉ졪¡ªºËÌÇÌåÑØmRNA5¡¯¶ËÏò3¡¯¶ËÒƶ¯£¬µ¼Ö´ÓN¶ËÏòC¶ËµÄ¶àëĺϳɡ£ëÄÁ´µÄÖÕÖ¹ÒÔ¼°ëÄÁ´µÄÊÍ·Å¡ª¡ªºËÌÇÌå´ÓmRNAÉϽâÀ룬׼±¸ÐÂÒ»Âֺϳɷ´Ó¦¡£ Ö÷Òª·ÖΪÎå²½ 1¡¢ Activation of Amino Acids (This reaction takes place in the cytosol, not on the ribosome). 2¡¢ Initiation. 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