问题 单项选择题

下列关于细胞内合成ATP的叙述,不正确的是()

A.细胞质基质中ATP的形成与氧气无关

B.在叶绿体中合成ATP需要光

C.线粒体和叶绿体都能产生ATP,但最初的能量来源不同

D.在线粒体中合成ATP所需要的能量都是来自[H]和氧气结合时释放的

答案

参考答案:D

解析:

A、细胞质基质中可发生无氧呼吸和有氧呼吸的第一阶段,这些过程中产生的ATP不需要氧气的参与,只有有氧呼吸的第三阶段需要氧气,场所是在线粒体内膜上。A对

B、在叶绿体中可进行光合作用,光合作用的光反应阶段可以产生ATP,场所是在叶绿体的类囊体薄膜上,光反应阶段必须有光才能进行。B对

C、线粒体的能量来源是呼吸作用所消耗的有机物中的化学能,而叶绿体中的能量来源是光合作用所吸收的光能。

D、在线粒体中可发生有氧呼吸的第二阶段和第三阶段,第二阶段是水和丙酮酸反应生成二氧化碳和[H],可释放出少量能量储存在ATP中。第三阶段合成的ATP所需要的能量来自于[H]和氧气的结合。所以D错

阅读理解

阅读理解。

     Health is the most important thing in the world. Nothing is more important than health. If one takes away

our money, houses, cars, or even our clothes, we can still survive.   1   That is why we always try to eat in

a healthy way and exercise regularly.

     How can we keep healthy? In order to eat healthily, I usually avoid eating food high in fat, like French fries

or cookies, which are junk foods.   2  Besides, I only eat little meat. 

       3   Taking exercise every day helps us build a strong body. Regular exercise is an important part of

keeping me healthy.

     What's more, I think friends are an important part of one's health.   4   I always feel better when I am with

friends than when I am alone. When I am with my friends, I always laugh. Laughing is also an important part

of health. It is good to stay with my friends.

     By eating properly and exercising regularly, I can keep my body at a proper weight and keep healthy. By

spending time with my friends, I can keep my mind as well as my body happy. These things sound easy to do,

but not many people can manage them.   5   

A. Many studies show that people with a narrow range of social contacts often get sick.

B. There are some people who like staying alone, but they keep healthy.

C. On the other hand, doing exercise is very important.

D. But if our health was taken away, it is certain that we would surely die.

E. I think a strong will is necessary if we want to keep healthy.

F. I eat a lot of vegetables and fresh fruit which are full of vitamins.

G. Some people appear fat because they often eat too much.

单项选择题