问题 多项选择题

下述哪些过程需要细胞本身耗能

A.维持正常的膜静息电位

B.膜去极化达阈电位时的大量Na+内流

C.动作电位复极化时的K+外流

D.递质释放时的胞裂外排

答案

参考答案:A,D

解析:
[考点] 细胞膜的物质转运
[分析] 细胞膜静息电位的维持需钠泵参加,需要耗能;递质释放时的胞裂外排是更复杂的主动活动,也是要耗能的。膜去极化时的Na+内流和动作电位复极化时的K+外流均为易化扩散,其能量来自电化学梯度,不需细胞本身耗能。

阅读理解
阅读理解。
Books Information
 Little Bull  Author: Ellen James
Main idea: The book tells us how the lovely 250-pound baby
elephant learns about the world around him
Price: 24.0 yuan
The Trouble with Teachers   Author: Barbara Calamari
Main idea: Angela has found herself in trouble
again at school with her teachers. She and her friends Gina and Johnny will be
  punished.
Price: 15.0 yuan
 I've Got a Secret   Author: Cathy West
Main idea: Nine-year-old Michelle got a new hot-pink notebook
as a birthday gift and she began to keep a diary every day.
Price: 30.0 yuan
Miss Nobody

Author: Tomek Tryzna
Main idea: At the age of fifteen, Marysia moves
with her parents to the nearest big city. Then she meets two girls, Kasia and
 Eva, and
 they begin to teach her the secrets of life.
Price: 33.0 yuan
1. Who is the author of the book Little Bull?
    A. Ellen James.            
    B. Barbara Calamari.    
    C. Cathy West.            
    D. Tomek Tryzna.
2. How much does the book The Trouble with Teachers cost you?
    A. 24.0 yuan.              
    B. 33.0 yuan.          
    C. 30.0 yuan.              
    D. 15.0 yuan.
3. Which book should you buy if you want to know about a kind of animal?
    A. I've Got a Secrets.        
    B. The Trouble with Teachers.  
    C. Little Bull.             
    D. Miss Nobody.
4. Cathy West's book is _____ yuan cheaper than Tomek Tryzna's.
    A. four      
    B. three      
    C.  two      
    D. one
5. Which of the following is TRUE according to the table?
    A. The book with the price of 30.0 yuan tells us how to keep a diary.
    B. Barbara Calamari's book tells us the story in Angela's home.    
    C. Miss Nobody is about a fifteen-year-old girl.
    D. If you pay 20.0 yuan, you can buy two books above.
材料分析题