问题 单项选择题

小麦植株中能使ADP含量增加的是()

①光合作用产生O2的过程

②叶绿体中[H]被消耗的过程

③线粒体中[H]被消耗的过程

④无氧呼吸产生酒精的过程

⑤神经递质释放的过程

⑥细胞以主动运输方式吸收钾离子的过程

⑦叶绿体中DNA的复制过程

A.②⑤⑥⑦

B.②③⑤⑥⑦

C.②③④⑤⑦

D.①②③⑤⑥

答案

参考答案:A

解析:

ATP水解生成ADP和Pi,并释放出能量,而ATP生成过程消耗ADP。

①是光合作用光反应阶段,水在光下分解,产生[H]和氧气,同时产生ATP,ADP被消耗,①错误;

②是暗反应阶段,三碳化合物被还原,消耗[H],同时ATP转化为ADP,所以ADP增加,②正确;

③是呼吸作用[H]被消耗是在第三阶段,与氧气结合生成水,同时释放大量能量,ADP转化为ATP,ADP减少,③错误;

④无氧呼吸产生酒精的同时释放少量能量,转移到ATP中,ADP减少,④错误;

⑤小麦无神经系统,不存在神经递质释放,所以此选项不考虑;

⑥⑦均需要消耗能量,ATP水解,提供能量,同时产生ADP,ADP增加,⑥⑦正确。

考点:本题考查ATP的合成与分解,意在考查考生能运用所学知识与观点,通过比较、分析与综合等方法对某些生物学问题进行解释、推理,做出合理的判断的能力。

阅读理解

About six years ago I was eating lunch in a restaurant in New York City when a woman and a young boy sat down at the next table, I couldn't help overhearing parts of their conversation. At one point the woman asked, “So, how have you been?” And the boy—who could not have been more than seven or eight years old—replied. “Frankly, I've been feeling a little depressed lately.”

This incident stuck in my mind because it confirmed my growing belief that children are changing. As far as I can remember, my friends and I didn't find out we were “depressed”, that is, in low spirits, until we were in high school.

Undoubtedly a change in children has increased steadily in recent years. Children don't seem childlike anymore. Children speak more like adults, dress more like adults and behave more like adults than they used to.

Whether this is good or bad is difficult to say, but it certainly is different. Childhood as it once was no longer exists. Why?

Human development depends not only on born biological states, but also on patterns of gaining social knowledge. Movement from one social role to another usually involves learning the secrets of the new social positions. Children have always been taught adult secrets, but slowly and in stages; traditionally, we tell sixth graders things we keep hidden from fifth graders.

In the last 30 years, however, a secret-revelation(揭示) machine has been equipped in 98 percent of American homes. It is called television. Television passes information to all viewers alike, whether they are children or adults. Unable to resist the temptation (诱惑),  many children turn their attention from printed texts to the less challenging, more attractive moving pictures.

Communication through print, as a matter of fact, allows for a great deal of control over the social information which children will gain. Children must read simple books before they can read complex materials.

小题1: According to the author, feeling depressed is ____________.

A.a sure sign of a mental problem in a child

B.a mental state present in all humans, including children

C.something that cannot be avoided in children's mental development

D.something hardly to be expected in a young child小题2:According to the author, that today's children seem adult-like results from ____________.

A.the widespread influence of television

B.the poor arrangement of teaching content

C.the fast pace of human scientific development

D.the rising standard of living小题3: What does the author think of communication through print for children?

A.It enables children to gain more social information.

B.It develops children's interest in reading and writing.

C.It helps children to read and write well.

D.It can control what children are to learn.小题4:What does the author think of the change in today's children?

A.He feels their adult-like behavior is so funny.

B.He thinks the change worthy of note.

C.He considers it a rapid development.

D.He seems to be upset about it.

名词解释