biology, physic 问题!!

purplepinky

请告诉我答案和解释，谢谢 ^^
biology
1. facilitated diffusion required energy in form of ATP?

2. facilitated diffusion occurs when molecules move from a region of high concentration to low concentration?

3. active transport occurs in almost all animal and plant cell?

4.plant cell membrane consist of phospholipids and proteins only,没有cellulose?

5. increase in temperature 会 increase the rate of active transport?

6.which is involved in facilitated difffusion?
   A. phospholipid
   B. polysaccharide
   C. polynucleotide
   D. polypeptide
(这四个到底是什么来的？)

7. which statement best describe facilitated diffusion?
    A. the passive movement of a particle across a cell membrane through a channel protein
    B. the movement of a particle down a concentrared gradient aided by protein pumps
(我选B,可是答案是A,为什么？)

8. which is an example of active transport?
   A. movement of nitrate ions into root hair cells
   B. movement of sodium ions in blood plasma

9. which part of the cell are directly involved with the absorption of digested materials into the blood?
   I. plasma membrane
  II.cytoplasm
III. mitochondria
IV. nucleus

A. I and II
B. II and III
C. I, II and III
D. all

10. 我要考试了，要背cellular component? 背function only?

11.
normal concentration of sodium ions in red blood cell = 44
normal concentration of pottasium ions in red blood cell=147

normal concentration of sodium ions in blood plasma = 131
normal concentration of pottasium ions in blood plasma =22

which of the statement is a suitable conclusion of the above information?

A. sodium ion is actively transported out of the cell
B. sodium ion is transported out of the cell by diffusion, but potassium does not move
C. sodium moves into the red blood cells by diffusion and then potassium moves out by diffusion
(答案是A? 为什么？)



physic

1. which is not derived from time and length only?
   A. density
   B. momentum
(两个都对？)

2. weight 是 mass x (length / time square)?

3. density of mercury is 13.6g cm^-3
    what is its density in kgm^-3?

A. 13.6 x 10^-3 kgm^-3
B. 13.6 x 10^3 kgm^-3

4. which is  correct?

A. 1000 mm^3 = 10^-6 m^3
B. 1000 mm^3 = 10^6 m^3
(答案是A 为什么不是B? )

purplepinky

回复 13# 鸟帮王子


    拜一就要考了，我还有其他科目也还没读啊

鸟帮王子

回复 12# purplepinky


    慢慢背，不要紧张。
我之前一点一点慢慢读的，结果出到很容易的题目><

purplepinky

回复 11# 鸟帮王子


    我拜一考试啊啊啊啊啊啊

    我不会bio T.T

鸟帮王子

回复 10# purplepinky


    不客气，努力加油..
我刚考完bio / physic...
哈哈，不过第一轮的出到太简单了^^
(我也是form 4^^)

purplepinky

回复 8# 鸟帮王子


    谢谢谢谢

鸟帮王子

回复 7# purplepinky


    我忘记了答案..哈哈，在玩游戏，懒惰找书^^

鸟帮王子

回复 6# purplepinky


    protein pump 我不知道。。
然后不是需要protein ,是在protein 那边发生...
facilitated diffusion 有两个地方发生，一个在carrier protein / 一个在pole protein
去找参考资料下...懒惰打到详细..哈哈

第8题我之前做过，答案就是那个...老师没解释..哈哈

第9 我是猜的，没看过那题目

11题的不关 水/solute 的事情,是关于active transport
关于水/solute 的事osmosis ...
from region of high concentration water potential to low .........xxxxx
或者是
from region of low concentration of solute to high ...... xxxxx

这个才是关于水/solute (osmosis)

purplepinky

回复 3# 鸟帮王子


    第2题的意思就是weight的formula是 mass x (length / time square)？

purplepinky

回复 5# 鸟帮王子


    关于第7题的，facilitated diffusion不是需要protein吗？

     channel protein和protein pump有什么分别？


    第8题为什么不是B？

     第9题你确定？为什么？可是书上的答案是B耶

   第11题的是底solute concentration去高 还是 低water concentration去高？