Copyright 2016 by the Rector and Visitors of the University of VirginiaRNA nucleotides or building blocks are structurally very similar to DNA and go by similar names The only exception is that RNA ha ID: 888558
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1 What is transcription? Copyright 2016
What is transcription? Copyright 2016 by the Rector and Visitors of the University of Virginia RNA nucleotides (or building blocks) are structurally very similar to DNA and go by similar names. The only exception is that RNA has uracil (U) instead of thymine (T). RNA T C G A A G C U An enzyme called RNA polymerase (pink circle) is needed for transcription. RNA polymerase is simply a protein in the cell, and its job is to match RNA nucleotides to the DNA nucleotides. The inset of this diagram shows that the rules of matching RNA and DNA building blocks are similar to double - stranded DNA, except that U (RNA) will pair with A (DNA). The RNA polymerase moves along a single stranded DNA and produces RNA. The end product for this step is that a single - stranded RNA is produced, completing a step of gene expression. Many copies of the RNA can be produced from a single DNA gene. DNA is a template for RNA
2 : RNA polymerase Transcription Fac
: RNA polymerase Transcription Factor Transcription takes place in the nucleus: s ingle stranded DNA Regulatory site where transcription factor is bound The RNA polymerase matched RNA nucleotides to the DNA template. single - stranded RNA is made from the DNA template (gene expression) When DNA is being transcribed, the DNA becomes single stranded (the DNA strands come apart) so RNA can be created . The DNA acts as a template . A hypothetical RNA nucleotide sequence is shown. DNA nucleotides = adenine = thymine = guanine = cytosine T C G A = adenine = uracil = guanine = cytosine R NA nucleotides A G C U RNA U C U A G C G A Hypothetical RNA sequence created from DNA template single stranded DNA Copyright 2016 by the Rector and Visitors of the University of Virginia What is transcription