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DNA/mRNA/tRNA

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DNA/mRNA/tRNA

Postby Diana Timpano » Wed Apr 27, 2005 2:50 am

Where can the following nucleic acid be found?

DNA - nucleus ?
mRNA - cytoplasm ?
tRNA - cytoplasm ?

Thanks in advance :)
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Postby mith » Wed Apr 27, 2005 3:38 am

I'm thinking the mRNA would also be in the nucleus to get the DNA copying process done.
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Re: DNA/mRNA/tRNA

Postby zami'87. » Wed Apr 27, 2005 7:33 am

Diana Timpano wrote:Where can the following nucleic acid be found?

DNA - nucleus ?
mRNA - cytoplasm ?
tRNA - cytoplasm ?

Thanks in advance :)

DNA(nucleus,mitohondria,hloroplasts)
mRNA(nucleus,cytoplasm,mitohondria,hloroplasts)
tRNA(cytoplasm,mitohondria,hloroplasts)
not sure for third.Maybe not for second nor first, o well 99%
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Postby thank.darwin » Wed Apr 27, 2005 6:46 pm

DNA - nucleus + Mitochondria and Chloroplasts
mRNA - cytoplasm + the nucleus during transcription
tRNA - Ribosomes + cytoplasm

Any more questions?
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Postby MrMistery » Wed Apr 27, 2005 8:05 pm

A little something to add at mARN
When mARN is first formed, it contains copies of introns as well as exons. Then it is cut into little pieces(the copies of the exons and introns) and then only the copies of the exons are put together to form mature mARN. So you can only find immature mARN in the nucleus
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Re: DNA/mRNA/tRNA

Postby zami'87. » Wed Apr 27, 2005 9:41 pm

zami'87. wrote:
Diana Timpano wrote:Where can the following nucleic acid be found?

DNA - nucleus ?
mRNA - cytoplasm ?
tRNA - cytoplasm ?

Thanks in advance :)

DNA(nucleus,mitohondria,hloroplasts)
mRNA(nucleus,cytoplasm,mitohondria,hloroplasts)
tRNA(cytoplasm,mitohondria,hloroplasts)
not sure for third.Maybe not for second nor first, o well 99%

oops :oops: :oops: :oops:
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Postby thank.darwin » Wed May 04, 2005 9:21 pm

MrMistery wrote:. Then it is cut into little pieces(the copies of the exons and introns) and then only the copies of the exons are put together to form mature mRNA


What happens to the intron pieces after processing in the nucleus?
Does it serve any function or is it just disposed of?
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Postby Jelanen » Wed May 04, 2005 9:51 pm

Introns are degraded by exonucleases because the next thing that happens is that the now snipped mRNA gets a 3' cap and a 5' poly-A tail that prevents exonuclease degradation.

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Postby thank.darwin » Wed May 04, 2005 10:21 pm

Thank-you Jelanen
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Postby MrMistery » Thu May 05, 2005 7:19 pm

Actually it is not the introns which are degraded, but copies of them that were found in the immature mARN. I'm sure Jelanen knew this, but this it is confusing for others that do not know it
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