问题 单项选择题

乳酸循环所需的NADH主要来自

A.三羧酸循环过程中产生的NADH
B.谷氨酸脱氢产生的NADH
C.脂酸B氧化过程中产生的NADH
D.糖酵解过程中3-磷酸甘油醛脱氢产生的NADH
E.磷酸戊糖途径产生的还原型烟酰胺腺嘌呤二核苷酸(NADPH)经转氢生成的NADH

答案

参考答案:D

解析:[解题思路] 无氧酵解时3-磷酸甘油醛脱氢产生的NADH不能传递给氧;为了再生出NAD以继续进行酵解,NADH的氢传递给丙酮酸生成乳酸,产生NADT。
[命题规律] 考察“糖酵解”。重点掌握。
[知识拓展] 酵解与有氧氧化比较。

\r\n \r\n
完形填空
Now you’ve finished three years of English study. There’s one way to demonstrate(展示)what you’ve learned-take a test!
Do you have any special methods(方法) you use to help you do better on a test? How well you do is often a matter of how well prepared you are. Here are some ways to make sure you’re at your best on test days.
Go to bed early. The night before a test is not the time to stay up watching TV. You want to be rested and wide-awake for test day.
Have a good breakfast. Test day isn’t a morning for donuts(面包圈).Nor is it a time to starve yourself. Eat plenty of low-sugar, high-energy food to keep your brain and body working their best.
Be prepared, Make sure you have two pencils and anything else you were asked to bring.
Watch the numbers. Make sure that the number of the items(项目)on your answer sheet matches the number of the question.
Look over all the answer choices(选择). Don’t assume(假定)that choice A is correct until you’ve checked the others. You may find a better one. And it is wrong to eliminate(排除)any choice that you can see at once. You’ll have a better chance of finding the right answer.
Check the clock. Make sure you allow yourself enough time to answer every question and go back and check your answers .Don’t spend too much time on any difficult question .Skip(跳读)it and come back to it later.
Keep up with your school work all year long That’s how you get the skills you need for taking tests.
四、填写表格,每空一词(10分)
How to make sure that you can do     1 on test days
   2 
Things you do
Going to bed early
Not 3  up or being asleep for test day
Having a good breakfast
Eating  4   low-sugar, high-energy food
Being prepared
Remembering to  5  two pencils and
the    6 things you were asked to bring
Watching the numbers
The number of your answer should   7  the number of the question
Looking over all the choices
Don’t assume that the choice A is correct   8    
you’ve checked the others
Checking the clock
  9  your time carefully and not spending too much on any difficult question
You will get the skills you need    10   you keep up with your schoolwork all year long