Biochemistry, urgent

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madman1611
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Biochemistry, urgent

Post by madman1611 » Wed Sep 19, 2007 6:21 am

Hey, guys. I'm having a lot of trouble with these 2 questions for homework (I've done around 27 and I'm completely shut down).

What special role is played by the amino acid cysteine? How do disulphide bridges influence protein structure and stability?

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MrMistery
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Post by MrMistery » Wed Sep 19, 2007 6:29 am

"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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Post by madman1611 » Wed Sep 19, 2007 6:54 am

Thanks very helpful. Hey, I forgot to post the second question (the first question was a single question).

Do all proteins have quarternary structure? Support your answer with examples.

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MrMistery
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Post by MrMistery » Wed Sep 19, 2007 9:08 am

No. actually most proteins don't. example: any protein made out of one polipeptide chain: lyzozime, titin etc
"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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