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F4 Bio 的问题
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我要present有关第3课的东西料, 可是我的老师完全一点都没有教到, 只是分组然后给你一个题目叫你两天后present,我的题目是 "The movement of subtances across the plasma membrane:pactive transport", 我们整组人讨论了两节都不明白...
有谁可以告诉我什么是concentration gradient, osmosis, facilitated diffusion是什么吗? 还有 carrier protein 和 pore protein 有什么不同? 还有ATP 和ADP...
还有这句是什么意思???
the concentration of potassium ions inside the cell is always higher than the concentration outside the cell, while the concentration of sodium ions outside the cell is always higher than the concentration inside the cells.
现在我才知道BIO..真的很难..
才F4刚开始我就招架不住了.... |
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发表于 7-3-2007 08:02 AM
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你不要那么担心,只要慢慢分析就可以了...
如果遇到不明白的字就分开那些字,然后找字典...
Osmosis= is the proceses when water diffuse across the membrane, From the low concentration side(Number of water molecule is higher) to the high concentration side(Number of water molucule is lower)...
Facilitated diffusion = is the proceses when substance Y (except water molecule) move across the membrane, from the the side that have high concentration of Y to the side that have low concentration of Y....
Carrier Protein= is a protein that carry the molecule(usually a large molecule) out or into the cell, it need energy(from ATP) to do this process...
Pore Protein= is a type of protein that carry the molecule (usually ions or large molecule) out or into the cell, it no need energy to do this process...
ATP is a molecule contain high energy, When the molucule break in to ADP and P, it will release some energy for our body used....
"the concentration of potassium ions inside the cell is always higher than the concentration outside the cell, while the concentration of sodium ions outside the cell is always higher than the concentration inside the cells."
这个句子你明白所有的字词吗?? 先明白所有字的意识,然后再连接起来,分析和明白...
Concentration= The number of a substance in a place(Example:liquid, cell...)
Potassium = a chemical substance....
ions = a chemical substance with charge (+ or -)...
Potassium ions = potassium with charge..
Sodium = a chemical sbustance also...
Sodium ions = sodium with charge
So the whole sentence mean,
inside the cell have more potassium ions than outside the cell,
for sodium ions, outside the cell have more sodium ions than inside the cell....
读bio请不要全部死背,你必须先了解他的过程,然后在记些key words,那就很容易明白和记住了....![](static/image/smiley/default/biggrin.gif) |
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发表于 7-3-2007 09:29 PM
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F4就那么难了。。
不错不错。。
楼上的已经回答了你的问题。。
以后有什么问题尽管问吧,我会尽量帮。。 ![](static/image/smiley/default/tongue.gif) |
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楼主 |
发表于 7-3-2007 09:57 PM
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Osmosis= is the proceses when water diffuse across the membrane, From the low concentration side(Number of water molecule is higher) to the high concentration side(Number of water molucule is lower)...
我在书找到的意思是:
osmosis is the movement of water molecules from a region of low solute concentration(high water concentration) to a region of high solute concentration (low water concentration) through a semi-permeable membrane.
我想知道 water concentration 是不是和 solute solute 相反的 ???
water concentration high=solute concentration low ???
Carrier Protein= is a protein that carry the molecule(usually a large molecule) out or into the cell, it need energy(from ATP) to do this process...
我想问pore protein是不是一定要有energy才能输送molecule ??
我的课本上pore protein under both pasif and active ..
谢谢你回应我哦... |
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楼主 |
发表于 7-3-2007 09:59 PM
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原帖由 chingfong85 于 7-3-2007 09:29 PM 发表
F4就那么难了。。
不错不错。。
楼上的已经回答了你的问题。。
以后有什么问题尽管问吧,我会尽量帮。。
还有一个问题...
为什么active transport可以against the concentration gradient ??? |
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发表于 8-3-2007 01:06 PM
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其实你书本的解释会比较好,但比较难明白...
Water concentration= number of water molecule in the region..
但 solute concentration= number of other sunstance molecule (except water molecule)in the region....
所以,
在water concentration 高时, solute concentration 会是低的...我们是比较water和其他substance 的ratio....
请问你要问pore protein 还是carrier protein??
Pore Protein是不用energy 的, 而且只发生pasif transport.....
Active Transport 可以against the concentration gradient,因为有用enerygy... |
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发表于 11-3-2007 04:26 PM
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原帖由 外星護法 于 7-3-2007 09:57 PM 发表
我想问pore protein是不是一定要有energy才能输送molecule ??
我的课本上pore protein under both pasif and active .. ...
pore protein是指有洞的protein,就是说可以让substance穿过的protein....
当然也可以包括carrier protein.....
因为pore protein也分成很多种,有些是用来passive的,有些是用来active的。。。
止于是那一些分类,除了carrier protein, channel protein等等更深的我想你不需要知道了。。。
因为连我都不记得,哈哈!![](static/image/smiley/default/tongue.gif)
如果那个protein是给active transport用的,那么一定是要用到energy.....
active transport很好的例子是transport of glucose....
你想看,如果我们的glucose transport是follow concentration的,那么当equlibrium的时候transport就会停。。。。
可是我们要产生力量来做日场活动就必需要大量的glucose才能操作,等到follow concentration的passive transport到来,蚊子都睡了。。。。
所以才会需要active transport,无时无刻都为cell加glucose,不然就没有力了。。。。 |
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发表于 11-3-2007 04:35 PM
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原帖由 外星護法 于 7-3-2007 09:57 PM 发表
我在书找到的意思是:
osmosis is the movement of water molecules from a region of low soluteconcentration(high water concentration) to a region of high soluteconcentration (low water concentration) through a semi-permeablemembrane.
我想知道 water concentration 是不是和 solute solute 相反的 ???
water concentration high=solute concentration low ???...
要提醒你,osmosis是一个很特别的transport....
它只transport水。。。。。
不是solute...
一定要through semi permeable membrane,因为membrane有用来passive transport的pore protein。。。
目的和其他passive transport一样,为了要达到equilibrium...
water concentration并不一定是和solute concentration相反。。。。。只是不同。。
至于为什么,当然是case by case啦。。。。不能明确的告诉你。。
water concentration high=solute concentration low ----就是osmosis要进行的requirement...
不然equilibrium料,osmosis还有什么搞头。。。。 |
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发表于 25-3-2007 08:33 PM
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原帖由 外星護法 于 6-3-2007 06:24 PM 发表
我要present有关第3课的东西料, 可是我的老师完全一点都没有教到, 只是分组然后给你一个题目叫你两天后present,我的题目是 "The movement of subtances across the plasma membrane:pactive transport&quo ...
是pasive transport吧... |
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发表于 2-4-2007 10:19 PM
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原帖由 lipterstar 于 11-3-2007 04:26 PM 发表
pore protein是指有洞的protein,就是说可以让substance穿过的protein....
当然也可以包括carrier protein.....
因为pore protein也分成很多种,有些是用来passive的,有些是用来active的。。。
止于是 ...
我老师讲的跟你有点不同
他说pore protein是carrier protein的一种。
pore protein 和 channel protein是一样的 |
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发表于 3-4-2007 10:48 AM
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原帖由 Fishy_小鱼 于 2-4-2007 10:19 PM 发表
我老师讲的跟你有点不同
他说pore protein是carrier protein的一种。
pore protein 和 channel protein是一样的
老实说,我的记忆力并不是很好。。。
懒惰查书了。。。
应该你老师说的是对的。。。
carrier protein除了pore protein之外,的确还有其他种类,上面的错误请包涵。。。 |
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发表于 10-2-2009 02:26 AM
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carrier 华语是 , pore 华语是, 你应该明白了吧 |
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