At first Bob was puzzled by Virginia s waving, but then it _____ his mind that she was trying to tel

题干

At first Bob was puzzled by Virginia s waving, but then it _____ his mind that she was trying to tell him something.

A：crossed

B：passed

C：occurred

D：opened

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A

甲状腺细胞可以将氨基酸和碘合成甲状腺球蛋白，并且将甲状腺球蛋白分泌到细胞外，其过程如图所示．结合图回答下列问题：

（1）甲状腺球蛋白的排出依赖于细胞膜的____ （特性），该过程所消耗的能量主要来自于____ ____ ．

（2）b过程发生的场所为____ ．若含¹⁸O的氨基酸在甲状腺细胞内的代谢过程中产生了H₂¹⁸O，那水中的¹⁸O最可能来自于氨基酸的____ （填写化学基团名称）．

（3）如用³H标记某种参与甲状腺球蛋白合成的氨基酸，放射性出现的先后顺序依次为____ （用图中序号表示）．