正确答案: B

DNA相同，蛋白质不同

题目：一种生物不同组织细胞的蛋白质和DNA分子，其组成和结构

解析：B

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举一反三的答案和解析：

[单选题]--- Bill, can I get you anything to drink?--- .

I wouldn't mind a coffee D． Doesn’t matter

[单选题]My friend showed me round the town,____________was very kind of him.

it

[单选题]The retired man donated most of his savings to the school damaged by the ea rthquake in Yushu ,________the students to return to their classrooms.

enabling