14.2 Polypeptide synthesis- Transcription and Splicing, and 14.3 Translation
- Created by: Rhys Cummins
- Created on: 29-04-12 17:27
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Proteins are made up of polypeptides.
Transcription
This is a very simple process where MRNA is produced from DNA.
A DNA molecule is split into single strands by DNA helicase.
Free bases are then joined together by RNA polymerase in order to form a single strand which is complimentary to the DNA strand.
This single strand is called pre-MRNA and contains many introns which don't code for any amino acids.
Splicing
This is where all the introns are taken out of pre-MRNA in order to form MRNA which is completely formed of exons.
Translation
A ribosome attaches to the start codon on the…
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