help please

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carlito-cool55
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help please

Post by carlito-cool55 » Fri Feb 09, 2007 9:25 pm

a student heats up a test tube containing large amount of protien and biuret reagent. She notices a colour change from violet to blue. Explain why heating causes a colour change.

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Locus
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Post by Locus » Fri Feb 09, 2007 11:54 pm

Becouse there is chemical reaction at the hight temperuture, and reagent bind to protein, that give new color (by the way - chang from violet to blue is a slight color change, becose those colorse is close to one another at the spectrum)
Evolution will arrange everything

bio_nerd101
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Carlotio_cool55

Post by bio_nerd101 » Thu Feb 22, 2007 3:13 pm

i think first you should stop calling your self cool and just stick to your name....second.....the color changed becuase of what she mxed...duh...

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MrMistery
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Post by MrMistery » Thu Feb 22, 2007 3:23 pm

Everyone is entitled to their own nickname as long as it respects the forum rules. And really now, ghandi once said "Only speak if you can improve on the silence"
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

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Dr.Stein
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Re: Carlotio_cool55

Post by Dr.Stein » Fri Feb 23, 2007 4:07 am

bio_nerd101 wrote:i think first you should stop calling your self cool and just stick to your name....second.....the color changed becuase of what she mxed...duh...

This is harsh! :(
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bio_nerd101
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hmmm......

Post by bio_nerd101 » Fri Feb 23, 2007 3:28 pm

okay....i know you guys are saying that to me but come on.....sorry!

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Post by Darby » Sat Feb 24, 2007 3:37 pm

I use biuret regularly and never use heat to facilitate the reaction - is that weird?

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