F.4 1條BIO mc題

[匿名]

2013-10-19 10:12 pm

Which of the following substances can pass through a cell membrane?
1. fructose
2. amino acids
3. enzymes

A. 1 and 2
B 1 and 3
C 2 and 3
D 1 2 3
我只肯定1係...

更新1:

ps : diffusion need cell membrane?

回答 (2)

Stardust

2013-10-20 3:21 am

✔ 最佳答案

1. fructose係一種單糖，單糖細小，可以通過細胞膜；2. amino acids係蛋白質基本單位，分子細小，可以通過細胞膜；3. enzymes係一種蛋白質，分子大，不能通過細胞膜.

Thus, answer is A

The relationship between amino acid and protein：

圖片參考：http://imgcld.yimg.com/8/n/HA00981853/o/20131019190811.jpg

Diffusion do not need cell membrane. If particle concentrations in two area are not the same, diffusion will be happen.

2013-10-19 19:24:19 補充：
圖畫簡陋，英文差劣（嘗試翻譯了幾句），請見諒。

2013-10-19 19:25:59 補充：
If particle concentrations in two areas are not the same, diffusion will be happen.

2013-10-19 19:56:13 補充：
都有參考下本bio書嘅......^^

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知足常樂

2013-10-20 3:43 am

「圖畫簡陋」？

此言差矣～

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