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Anaerobic Respiration

Discussion of all aspects of biological molecules, biochemical processes and laboratory procedures in the field.

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Anaerobic Respiration

Postby catwhoplaysguitar » Sun Dec 04, 2005 11:50 am

For my A2 coursework I need the equations for anaeroibc respiration in yeast for: Glucose, Lactose and Sucrose.

I know glucose: C6H12O6 goes to 2CO2 + 2C2H5OH

But I don't know sucrose or lactose.

Please help me.
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Postby MrMistery » Sun Dec 04, 2005 11:52 am

:) :) :)
They are exaclty the same. The yeast first breaks down lactose and sucrose into monosacharides. From sucrose 2 glucose molecules result, and from lactose, one glucose and one galactose if i remember correctly...
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Postby catwhoplaysguitar » Sun Dec 04, 2005 11:55 am

Thanks, but how do they break the disacharrides down, what enzymes do they use, I need to know this so I can find out what temp to keep the experiment at so they work at optimum levels.
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Postby MrMistery » Sun Dec 04, 2005 11:56 am

Even easier: by hidrolysis:
for breaking lactose: lactase
for breaking sucrose: sucrase
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Postby catwhoplaysguitar » Sun Dec 04, 2005 12:00 pm

Thanks, now I can find out optimum temps, and I should have seen the names coming. :oops:
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Postby Poison » Sun Dec 04, 2005 5:27 pm

MrMistery wrote:: From sucrose 2 glucose molecules result


I think you are confused when typing. 2 glucose is maltose, sucrose is fructose and glucose.
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Postby MrMistery » Sun Dec 04, 2005 8:38 pm

Oh yes, you are right... When, anyone can make a mistake, even me :)
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Postby scottyiu » Wed Dec 07, 2005 11:34 am

Which one is the sweetest sugar?
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Postby Poison » Wed Dec 07, 2005 5:40 pm

As much as I know, fructose.
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Postby MrMistery » Wed Dec 07, 2005 7:15 pm

No idea... What scale measures sweetness?
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Postby canalon » Wed Dec 07, 2005 10:26 pm

MrMistery wrote:No idea... What scale measures sweetness?

Have a look here for the value of relative sweetness. I guess the measure is measured, as for peppers with experimented tasters comparing different solutions of the sweeteners.
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Postby scottyiu » Wed Dec 07, 2005 11:47 pm

Wow, i never knew that there were so many types of sugar...
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