问题 单项选择题 A1/A2型题

1分子β-羟丁酸彻底氧化为CO和HO生成多少分子ATP()

A.20.5

B.22.5

C.24.5

D.26.5

E.29.5

答案

参考答案:B

解析:

β-羟丁酸脱氢(NADH+H+)再裂解为2分子乙酰辅酶A,氢进入呼吸链氧化生成2.5分子ATP,2分子乙酰辅酶A进入三羧酸循环生成20分子ATP(注:NADH+H+和FADH2进入呼吸链与氧化合生成水与ADP的磷酸化耦联分别生成2.5分子和1.5分子ATP是最新算法)。

阅读理解

根据短文内容补全下列句子。

     Dick was a twenty-year-old man. His father was a teacher and taught chemistry in a middle school and

his mother worked in a shop. They lived a happy life until his parents died one night when there was an

earthquake (地震). Luckily his sister had taken him to see their aunt in the city and they were not at home.

Everything was destroyed in the earthquake and the two children got into trouble. Thanks to their aunt, who

was not rich, they grew up but they lived a hard life. Dick's sister was so sad that she became a nun (修女).

After Dick finished middle school, he found a job in a hotel and began to work there.

     One day the young man fell to the ground while he was cleaning a window on the second floor. He was

sent to the hospital and the doctor looked him over. One of his legs was broken and he had to stay in hospital.

He said to the nurse, "I'm a poor man, madam. Arrange a third-class ward for me, please."

     "Can't any body help you?" she asked. 

     "No, madam," answered Dick. "I have only a sister. She's a nun and she's poor, too."

     "I don't think so," the nurse said angrily. "Nuns usually marry God. And God is the richest person in the

world, you know!"

     "Well, then," Dick said with a smile, "Please arrange a first-class ward for me and send the bill to my

brother-in-law (姐夫)."

1. Dick and his sister lived a happy life until ______.

2. Their aunt was not rich, so they grew up but ______.

3. After Dick finished middle school, ______.

4. Dick asked the nurse to arrange a third-class ward for him because ______.

5. "Ward" means ______ in Chinese.

选择题