Cellular respiration

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seancassell
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Cellular respiration

Post by seancassell » Sun Mar 13, 2005 8:49 pm

Hi there;

In my grade 12 biology class, we're just ending a unit on cellular respiration (using glucose to produce energy in mitochondria). I'm confused about how the cell breaks down things other than glucose -- I mean other carbohydrates (e.g. maltose, lactose, fructose...), vitamins, lipids, etc. Is it also done in the mitochondria? Does it go through the same stages (Krebs cycle, chemiosmosis, etc.)?

I realize describing the processes may be very time consuming, so I would appreciate even just a link to a website that has an explanation.




Thank you,

Sean Cassell

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mith
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Post by mith » Sun Mar 13, 2005 10:02 pm

I believe other carbs are broken down by the digestive system and enzymes until they reach the monosaccharide stages.

Vitamins act as coenzymes, I don't think cells digest them. They are more of a tool to be used in conjunction with other things.
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Poison
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Post by Poison » Sun Mar 13, 2005 10:11 pm

To explain shortly, some compounds are converted into glucose and used like that. Some compounds enter the reaction from a certain stage and goes on cellular respiration.
And, an important point: You can use carbohydrates, lipids and proteins as energy sources; but you can not use vitamins.
look at this: (the last picture)

http://www.emc.maricopa.edu/faculty/far ... kGlyc.html
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Post by MrMistery » Sun Mar 13, 2005 10:55 pm

as it was already said, vitamins can not be broken down: they act as biocatalysts.
Now, did you ever wonder what the formula of fructose is?- C6H12O6 just like glucose, maltose and every other monosaccharide(you don't have to use the long word, just say simple sugars :D :D ) The process is almost identical to that of glucose
Now, no book says how exactly fat acids and aminoacids are methabolised, by you must know that the most toxic thing in our body, the one that we have urine for, ammonia, comes from catalysing aminoacids.
also you should know that the body uses sugars first, when they are gone it resorts to lipids and when they are gone too it burns proteins
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Andrew
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Post by thank.darwin » Sun Mar 13, 2005 11:00 pm

Proteins and fats can be broken down into pryuvate (I know I didn't spell that right) Then they can enter the prep or Krebs cycle... depending on where they enter they generate about the same amount of ATP. Does that help?
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Post by Poison » Sun Mar 13, 2005 11:30 pm

thank.darwin wrote:...down into pryuvate (I know I didn't spell that right) Then they can ...

It is PYRUVATE or PYRUVIC ACID :)
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Post by MrMistery » Sun Mar 13, 2005 11:59 pm

or you can just call it good old CH3-CO-COOH
:D :D
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Post by seancassell » Mon Mar 14, 2005 12:19 am

So, the long and the short of it is that polysaccharides/oligosaccharides/monosaccharides/lipids/etc. are all broken down into pyruvate, after which the rest of the cellular respiration cycle is the same?

And vitamins are cofactors, so they aren't metabolized?



Interesting! Thank you all!

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thank.darwin
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Post by thank.darwin » Mon Mar 14, 2005 1:17 am

Poison wrote: It is PYRUVATE or PYRUVIC ACID :)


Thank-you! :D
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Post by Poison » Mon Mar 14, 2005 4:59 pm

seancassell wrote:So, the long and the short of it is that polysaccharides/oligosaccharides/monosaccharides/lipids/etc. are all broken down into pyruvate, after which the rest of the cellular respiration cycle is the same?
And vitamins are cofactors, so they aren't metabolized?
Interesting! Thank you all!


look at the diagram again please. Not all of the compounds are converted to pyruvate before they are broken down. Some of them enter the reaction from a certain place.
Vitamins are COENZYMES (most of them). and they are not broken down for energy.
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Post by Poison » Mon Mar 14, 2005 5:01 pm

MrMistery wrote:or you can just call it good old CH3-CO-COOH
:D :D

Yes. But it would take years to write that formula. :P :lol: (just kidding)

thank.darwin wrote:Thank-you! :D


You're welcome
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Post by mith » Mon Mar 14, 2005 8:32 pm

Isn't there a different way which proteins and lipids are converted into energy(not thru pyruvic acid)?
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