题干

下列关于细胞结构和功能的叙述,错误的是(  )

A:性激素主要是由内质网上的核糖体合成

B:囊泡可以由内质网向高尔基体转运

C:蛋白质是细胞核中染色质的组成成分

D:蛋白质类激素经囊泡运输分泌到细胞外

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答案(点此获取答案解析)

A

同类题1

    For years I wanted a garden.I'd spend hours thinking of different things I could plant that would look nice together.
But then we had Matthew, and Marvin, and the twins Alisa and Alan, and then Helen.I was too busy raising them to grow a garden.
Money was not enough.Neither was time.Often when my children were little, one of them would want something that cost too much, and I'd have to say, “Do you see a money tree outside? Money doesn't grow on trees, you know.”
    Finally, all the children got through high school and college and were off on their own.I started thinking again about a garden.
Then, one spring morning, on Mother’s Day, I was working in my kitchen.Suddenly, I looked out of the window and there was a new tree, planted right in my yard.There were things blowing around on it.Then I put my glasses on—and I couldn't believe what I saw.There was a money tree in my yard!
    I went outside to look.It was true! There were dollar bills(帐单), one hundred of them, hanging all over that tree.There was also a note among them, “Thank you for your time, Mom.We love you!”
    Later, my children bought me tools, ornaments, a sunflower stepping stone and gardening books.A new page started in my life.
That was three years ago.My garden's now very pretty, just like I wanted.When I go out and take care of my flowers, I don’t seem to miss my children as much as I once did.It feels like they're right there with me.Now every year when winter comes, I look out of my window and think of the flowers I'll see next spring in my little garden.I think about what my children did for me, and I get tears in my eyes—every time.
I'm still not sure that money grows on trees.But I know love does!