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Author Topic: Nerd's Biology Questions  (Read 4507 times)  Share 

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nerd

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Nerd's Biology Questions
« on: January 21, 2009, 09:44:42 pm »
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I'm picking up Biol as a 3/4 without completing 1/2, so I have quite a few questions regarding the holiday homework my teacher set. Hopefully you guys will be able to help.

1. Explain what is meant by lipid soluble and the significance of this to molecules in cells.
2. Why is hydrogen bonding between water molecules important to a 100-m tall gum tree?
3. Polymers result when bonds between monomers are formed with the removal of water. Suggest a war that the bongs between monomers could be broken. Justify your answer.

Thanks.
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hard

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Re: Nerd's Biology Questions
« Reply #1 on: January 21, 2009, 09:58:13 pm »
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I'm picking up Biol as a 3/4 without completing 1/2, so I have quite a few questions regarding the holiday homework my teacher set. Hopefully you guys will be able to help.

1. Explain what is meant by lipid soluble and the significance of this to molecules in cells.
2. Why is hydrogen bonding between water molecules important to a 100-m tall gum tree?
3. Polymers result when bonds between monomers are formed with the removal of water. Suggest a war that the bongs between monomers could be broken. Justify your answer.

Thanks.

mmm let me try my best and hopefully some one can verify:

1. mmm lipid soluble basically means compounds that are soluble in lipids.

2. One of the features of water is capillarity. That is, water molecules are able to creep up narrow spaces because of the fact that they form strong hydrogen bonds between each other. Thus a 100m tall tree would need molecules with strong enough bonding to reach its height and the ability to creep through narrow spaces within the tree.

3. a way in which bonds b/w monomers can be broken is by adding water. This is done by splitting water molecules into hydrogen and hydroxide ions.

jackinthepatch

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Re: Nerd's Biology Questions
« Reply #2 on: January 23, 2009, 04:30:22 pm »
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Hard is right about lipid soluble substances, but adding on to that: the significance of lipid soluble molecules is that they are soluble in lipids (obviously lol), and in turn they are easily able to pass through the plasma membranes of cells, which is made of a phospholipid bilayer. Substances that are lipid soluble can pass through the lipid bilayer of a cell membrane relatively quickly, and with no input of energy required.
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NE2000

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Re: Nerd's Biology Questions
« Reply #3 on: January 25, 2009, 02:46:40 pm »
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I'm picking up Biol as a 3/4 without completing 1/2, so I have quite a few questions regarding the holiday homework my teacher set. Hopefully you guys will be able to help.

1. Explain what is meant by lipid soluble and the significance of this to molecules in cells.
2. Why is hydrogen bonding between water molecules important to a 100-m tall gum tree?
3. Polymers result when bonds between monomers are formed with the removal of water. Suggest a war that the bongs between monomers could be broken. Justify your answer.

Thanks.

mmm let me try my best and hopefully some one can verify:

1. mmm lipid soluble basically means compounds that are soluble in lipids.

2. One of the features of water is capillarity. That is, water molecules are able to creep up narrow spaces because of the fact that they form strong hydrogen bonds between each other. Thus a 100m tall tree would need molecules with strong enough bonding to reach its height and the ability to creep through narrow spaces within the tree.

3. a way in which bonds b/w monomers can be broken is by adding water. This is done by splitting water molecules into hydrogen and hydroxide ions.

Just on Q2, you're right about the capillarity. I would just say that for a 100 m tall gum tree, water is drawn up from the roots to the leaves (where it can participate in photosynthesis) through the phloem due to the capillary action which is in turn due to hydrogen bonding between molecules. This capillary action allows the water to travel upwards despite the downward force of gravity that would otherwise make it impossible for the water to reach the leaves. That just establishes why a 100 m tall gum tree needs it.
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nerd

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Re: Nerd's Biology Questions
« Reply #4 on: January 25, 2009, 02:57:53 pm »
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Thanks everyone for your answers! Another question: Why do you think it is an advantage to a eukaryotic cell to possess different types of organelles?
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jackinthepatch

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Re: Nerd's Biology Questions
« Reply #5 on: January 25, 2009, 03:22:31 pm »
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I wouldn't really know the correct way of answering this but I would say something along the lines of: Because each organelle has a specific role in the functioning of the cell, having different types of these specialised organelles allows cellular processes to occur more efficiently and effectively. Whereas if a cell had only one type of organelle that performed every role in the maintenance of the cell, some processes would not occur that efficiently. That's the best I've got lol, anyone else?
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jackinthepatch

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Re: Nerd's Biology Questions
« Reply #6 on: January 25, 2009, 03:28:15 pm »
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Just as an example to my answer. If mitochondria had to perform the processes of aerobic respiration, as well as having to destroy debris and foreign matter as a lysosome would, then neither of these processes would be performing as efficiently as they would be if there was a single organelle for each process.
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nerd

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Re: Nerd's Biology Questions
« Reply #7 on: January 25, 2009, 03:38:15 pm »
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Also, what processes in the cell would stop if its nucleus was removed?
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jackinthepatch

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Re: Nerd's Biology Questions
« Reply #8 on: January 25, 2009, 05:03:03 pm »
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Well I know cells can still function without a nucleus, case in point: red blood cells. For starters, cell division would not occur. But mainly I would say that because DNA within the nucleus is the blueprint for protein production, the process of manufacturing proteins would stop, which would no doubt affect the lifespan of the cell, because the cell would need a constant supply of new proteins for growth and maintenance. Basically, all the processes of the cell would eventually stop. That's what I think anyway.
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