RAMON ANDRADE 3DCIENCIA / SCIENCE PHOTO LIBRARY RAMON ANDRADE 3DCIENCIA / SCIENCE PHOTO LIBRARY
RNA polymerase II. Molecular model showing the structure of the enzyme RNA polymerase II (blue and white) in complex with Transcription Initiation Factor IIB ( TFIIB, pink). This enzyme synthesises a complementary mRNA (messenger ribonucleic acid) strand from a strand of DNA (deoxyribonucleic acid) during a DNA transcription. The RNA polymerase molecule is uses the original DNA strand as a template for the mRNA. DNA and its protein product. TFIIB is one of several general transcription factors that make up the RNA polymerase II preinitiation complex.
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