DNA Transcription — Basic Detail | HHMI BioInteractive Video
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DNA Transcription — Basic Detail | HHMI BioInteractive Video

SPEAKER: What you
are about to see is DNA’s most
extraordinary secret, how a simple code is turned
into flesh and blood. It begins with a bundle
of factors assembling at the start of a gene. A gene is simply a length of
DNA instruction stretching away to the left. The assembled factors trigger
the first phase of the process, reading off the
information that will be needed to make the protein. Everything is ready to roll. Three, two, one, go. The blue molecule racing along
the DNA is reading the gene. It’s unzipping the
double helix and copying one of the two strands. The yellow chain
snaking out of the top is a copy of the
genetic message, and it’s made of
a close chemical cousin of DNA called RNA. The building blocks to make
the RNA enter through an intake hole. They are matched to the DNA
letter by letter to copy the A’s, C’s, , T’s,
and G’s of the gene. The only difference is
that in the RNA copy, the letter T is replaced with
a closely related building block known as U. You are
watching this process called transcription in real time. It’s happening right now in
almost every cell in your body.

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