A、轉(zhuǎn)氨酶屬于蛋白質(zhì),在核糖體上合成,A正確;
B、糖原屬于糖類,其合成場所不是核糖體,B錯誤;
C、膽汁是在膽囊中形成的,不是干細胞內(nèi)合成的,C錯誤;
D、尿素是細胞新陳代謝產(chǎn)生的廢棄物,不是蛋白質(zhì),D錯誤.
故選:A.
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