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Prokaryotic Transcription

by Georgina Cornwall, PhD
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    00:00 As the little green dots, the DNA polymerases here are transcribing the DNA strand, recall that the prokaryotic cells, bacterial cells do not have a nucleus.

    00:15 And so the ribosomes have direct access to the strands and will begin to translate them as they are being transcribed, which is a pretty cool system.

    00:27 So we have multiple RNA polymerases polymerizing RNA strands and multiple ribosomes on those messenger RNA strands getting right to work, translating them into their polypeptide products.

    00:42 So we call these polyribosomes, because there are many of them on each messenger RNA and they are producing polypeptide strands that are fairly fast rate and they tend to look like under a microscope little Christmas trees.

    00:57 So the longer strands are by the ribosomes that have been on the messenger RNA the longest.

    01:02 And as the messenger RNA is being produced, they are climbing up it essentially.

    01:08 The ones on the end have shorter polypeptide chains because they’ve had less time and less of the mRNA to transcribe so far.

    01:19 So now we need to look at little bit at eukaryotes and how things are different.


    About the Lecture

    The lecture Prokaryotic Transcription by Georgina Cornwall, PhD is from the course Gene Expression.


    Included Quiz Questions

    1. …the coupling of transcription and translation processes in the prokaryotes.
    2. …that the translation and replication are coupled together in the prokaryotic cells.
    3. …the coupling of replication and transcription in the prokaryotes.
    4. …that the ribosomes are produced within the nucleus.
    5. …that a bacteria can produce different types of proteins from the same mRNA.

    Author of lecture Prokaryotic Transcription

     Georgina Cornwall, PhD

    Georgina Cornwall, PhD


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