Qualification > Reference Material
6BI05 Scientific Article June 2011 Discussion
AbdulKareem:
--- Quote from: notReverend on June 21, 2011, 03:30:03 pm ---5) how do peptide hormones lead to the formation of proteins? (like what is peptide hormones?)
I won’t answer the first part because honestly, it is a tough question (for me at least), and after searching it online for some time, it looks like protein synthesis is indirectly influenced by peptide hormones, but I could be wrong.
Peptide hormones, also referred to as protein hormones vary considerably in size (anywhere from 3 amino acids to the size of a glycoprotein). Most of them circulate in the blood without getting bound to other proteins and the half-life of circulating peptide hormones is only a few minutes. If they do not immediately circulate into the bloodstream, they are stored in the granules of the concerned cells.
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Peptide hormones act as transcriptional factors, binding to the repressor on the promotor on the gene responsible for the production of a certain protein/enzyme. It changes its shape and releases it, freeing the promotor so that RNA polymerase can now bind to it. Then the gene is trascribed and the mRNA is translated to produce the protein.
Hope that helps :D
notReverend:
--- Quote from: Ghayth on June 21, 2011, 04:09:59 pm ---Could they really ask something like this ? I mean aren't questions about the article supposed to relate things in the article to topics we took in our course ? How could they ask about differences of something you never heard of before :-\
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you deffo have a point. i don't think a question like this will actually be on the paper tomorrow, because like you said, we've just read about atrophy and dystrophy, so it really shouldn't be asked. i'm only answering it here because someone put the question up, and i said i would answer them.
certainly working my brain here, though :)
don't sweat it, though. i'm sure questions that actually come from our syllabus will show up and not the other way around.
good luck everyone!
notReverend:
--- Quote from: AbdulKareem on June 21, 2011, 04:14:16 pm ---Peptide hormones act as transcriptional factors, binding to the repressor on the promotor on the gene responsible for the production of a certain protein/enzyme. It changes its shape and releases it, freeing the promotor so that RNA polymerase can now bind to it. Then the gene is trascribed and the mRNA is translated to produce the protein.
Hope that helps :D
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thanks! it deffo did! gawd, i just hope this doesn't actually come up on the paper, though. how many people know all this stuff? i'm getting all the answers from the internet, not me textbook!
Ghayth:
Don't get me wrong , thanks a lot for answering :P ! I just panicked because I couldn't answer
notReverend:
anytime, anytime. what are we here for, right?
i'm waaay too tired to panic now. i hate edexcel and i cannot wait to see three really good grades on my certificate. :)
i just hope that everyone else had good grades, too. ;D
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