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dehydration and hydrolysis reactions

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dehydration and hydrolysis reactions

Postby Erised » Sun Sep 25, 2005 5:53 pm

Hey all!

I have this list of things I need to know for my Biology test, and there are two questions that I am not sure about. I just want to make sure that I understood the question correctly and that I got the right answer.

1. Understand condensation reaction to polymerize monosaccharies, disaccharides, and polysaccharides.

My answer:

Dehydration (condensation) Reaction – two molecules are covalently bonded to each other through a loss of water molecule.
• When a bond forms between two monomers, each monomer gives part of the water molecule that is lost. One provides hydroxyl group (-OH), and another provides hydrogen (-H)
• In order to polymerize monosaccharides, disaccharides, and polysaccharides, such reaction ^ is repeated as monomers are added to the chain by one.
• The cell must have a lot of energy in order to make so many dehydration reactions, and enzymes help the cells to it.


2. Understand hydrolysis of hydrocarbons to monosaccharids

My Answer:

Hydrolysis: reverse of dehydration reaction; to break with water.
Bonds between monomers are broken by the addition of water molecules.
Since monosaccharides are single sugars, they are the building blocks of larger carbohydrates. While carbohydrates form by dehydration reaction, they can also be broken back to monosaccharides by a hydrolysis reaction.

Also, what does "nomenclature of Hydrocarbons" mean?
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Postby mith » Sun Sep 25, 2005 6:53 pm

Naming organic molecules.. Good luck buddy, you'll need it.
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Postby Erised » Sun Sep 25, 2005 6:57 pm

what?

what do you mean I'll need it?
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Postby MrMistery » Sun Sep 25, 2005 7:05 pm

what you are studying is very hard. But you seem to have a good grip
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Postby Erised » Sun Sep 25, 2005 7:10 pm

really? So it's right? :lol:
I didn't think it was that hard.. this is my firs test in college as a Bio major.. and I don't want anything less than a high B.

mithrilhack scared me. I thought he meant that I got everything wrong and so dumb that I need all the good luck I can get. :shock:
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Postby MrMistery » Sun Sep 25, 2005 7:30 pm

I didn't say you got it right. I can't say that because i don't know exactly what you should have said. I have never heard the term dehidration used for synthesis of complex ploisaccharids. But it seems to be correct. take not also that not all cells have these capabilities
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Postby mith » Sun Sep 25, 2005 11:28 pm

Let me clarify my response, nomenclature is like one of the hardest things in organic chemistry simply by the sheer amount of rules prefixes, suffixes etc..
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Sounds correct ;)

Postby sillysunrise » Mon Sep 26, 2005 4:10 am

Looks like you have the right idea:)


Good luck ;)
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Postby victor » Tue Sep 27, 2005 12:02 pm

Erised wrote:what?

what do you mean I'll need it?


haha...it's my favorite..naming organic molecules..till now I only get 9 names of hydrocarbon function groups which are alkane, alkene, alkune, alcohol, ether, aldehyde, ketone, carboxylic acid and ester...

Um, for your first post..let me add a few..hope you like it.. :D
condentation reaction is the reaction to dehydrate monosaccharide to form di-, oligo- or poly- saccharide by 'cut' down H atom from one monosaccharide and OH molecule fron other saccharide to form H2O. the remaining sites that had been 'cut' down is only O atoms, so this O atoms form a bond to each carbon group..

H-C-OH + H-C-OH ----> H-C-/OH + H-C-O/H --->[H-C]-O-[C-H] + H2O

I think that's the reaction... :lol:
hope this clear enough..and sorry if you get more confused by this.. :lol:
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Postby Jelanen » Tue Sep 27, 2005 9:12 pm

Yeah, your answers look good though I don't completely understand the second question since its a fairly complex pathway to go from just a hydrocarbon (acetyl in the case of most organisms) to a monosaccharide...

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Postby victor » Thu Sep 29, 2005 11:47 am

what I think is.....maybe..acetyl will combine with other carbon source to form PGA then PGAL....after that, 2 molecules of PGAL combined to form monosaccharide..
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Postby ibnerd101 » Sat Jan 20, 2007 7:37 pm

omg lol yes i think you have it right! you said 1st year university bio major right? ha well , i just finished taking this! i have an exam thursday and im studying for it now (grade 11) good luck!
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