题目

下列关于细胞结构和功能的叙述，正确的是（ ） A．性激素主要是由内质网上的核糖体合成，所以内质网上没有酶的分布 B．葡萄糖分解为丙酮酸的过程发生在线粒体基质中 C．膜蛋白的形成与核糖体、内质网、高尔基体有关 D．原核生物没有含膜的细胞器和核膜，所以原核生物无生物膜 答案：解：A、性激素属于脂质，其合成场所是内质网，且在内质网上分布有大量的酶，A错误； B、葡萄糖分解为丙酮酸的过程发生在细胞质基质中，B错误； C、膜蛋白在核糖体上形成，还需要内质网和高尔基体的加工和转运，因此其形成与核糖体、内质网、高尔基体有关，C正确； D、原核细胞没有含膜的细胞Jack is 10 years old, and I am his pencil. I’m Jack’s helper(助手).Jack’s pencil box is my home. I have some friends here. They are seven crayons, a ruler, a pencil sharpener and an eraser. Because Jack loves me, I’m the king(国王) in the pencil box. My friends and I are happy every day.Today, I am not happy because a pen comes in. It’s new and beautiful. It’s a music pen. It can not only (不仅) write but also(而且) sing. But I’m old and I can only help Jack to write. Jack likes it so much! The new pen is his helper now. it’s the new king. What can I do now? Shall I go to a new home.【1】Who is the king now?A. The pencil B. The pen C. Jack D. The pencil box.【2】What’s the old pencil’ home?A. The eraser. B. The ruler C. The new pen D. The pencil box【3】How many friends does the pencil have?A. Four. B. One C. Seven D. Ten【4】According to the passage, Jack is probably (很可能) a ________,A. student B. pencil case C. schoolbag D. pencil【5】We can know from the passage(文章) that __________.A. the old king is not happy now B. our pencil aren’t our helpersC. the pen is old but beautiful D. Jack doesn’t need the pencil any more