题目

俗话说“种瓜得瓜,种豆得豆”,这主要与细胞中的何种结构有关( )A. 细胞核 B. 细胞质 C. 细胞膜 D. 细胞壁 答案:【答案】A【解析】试题细胞核中能被碱性染料染成深色的物质叫做染色体,它是由DNA和蛋白质两部分组成,DNA是主要的遗传物质,呈双螺旋结构,一条染色体上包含一个DNA分子,一个DNA分子上包含有多个基因,基因是DNA上具有特定遗传信息的遗传片段,“种瓜得瓜,种豆得豆”这种现象主要决定于细胞Often, when he       something that       him, he wasted his time drawing little pictures.   A.should be doing, gave    B.should have been doing, was given   C.should do, was given    D.should have been doing, had given
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