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Polypeptide Synthesis

Transcription splicing translation

DNA pre-mRNA mRNA polypeptide


1. The enzyme DNA helicase hydrolyses hydrogen bonds in a specific region of the DNA
molecule, causing the 2 strands of the DNA to separate and expose the bases.
2. The enzyme RNA polymerase moves along one DNA strand, the…

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number of different proteins depending upon the order in which the exons are combined. A splicing
error such as this is believed to cause Alzheimers disease.

mRNA arrives at a ribosome from the nucelus (via nucelic pores.) Translation takes place at the
ribosomes. Is in this stage in which…


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