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Protein Synthesis/DNA replication question. PLEASE HELP

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Protein Synthesis/DNA replication question. PLEASE HELP

Postby reyrey389 » Mon Nov 07, 2011 7:24 am

How and why is it that protein synthesis may occur at the same time as DNA replication in the cell (in the S phase)


I know this is true for sure because I heard my teacher say so; however, I forgot hearing her saying why and how...
So If someone may please explain, I'd really appreciate it :D
Last edited by JackBean on Mon Nov 07, 2011 8:26 am, edited 1 time in total.
Reason: No need to shout on us. Again!
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Postby biohazard » Mon Nov 07, 2011 7:53 am

For starters,

Where does the DNA replication take place?

and

Where does the protein synthesis take place?

How are these two processes related, or are they?

Check through the different phases of protein synthesis and cell division (some nice figure, perhaps) and it should become quite obvious why both can happen at the same time.
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Postby JackBean » Mon Nov 07, 2011 8:27 am

rey: what you probably mean is how can replication and transcription take place at one moment, right?
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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Postby reyrey389 » Mon Nov 07, 2011 9:51 am

JackBean: yyour first part is right, but for you second part you only said transcription, protein synthesis involves transcription and translation.

so the question is how can these two processes [DNA Replication and Protein Synthesis(transcription/translation)] take place simulataneously?
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Postby JackBean » Mon Nov 07, 2011 10:15 am

and why couldn't?
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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Postby Cat » Mon Nov 07, 2011 6:00 pm

1. DNA replication would prohibit transcription BUT not translation.
2. Transcription and translation are NOT necessarily coupled.
3. Each mRNA is translated multiple times (depending on its half-life).
4. mRNA can be stored in the cytoplasm for the future. Look up RNA-mediated non-mendelian inheritance.
5. Also look up Asymmetric inheritance.
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Re: Protein Synthesis/DNA replication question. PLEASE HELP

Postby chrisPbacon » Mon Nov 07, 2011 10:55 pm

So the question is how can these two processes [DNA Replication and Protein Synthesis(transcription/translation)] take place simulataneously?

You need to be more specific like Jack stated. Because actual protein synthesis is carried out by the ribosome and can only happen after DNA replication. Unless you are referring to the process OF protein synthesis, which doesn't necessarily mean a protein is being synthesized, but is taking the steps to be synthesized.
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