Friday, December 20, 2013

Protein Synthesis!

There are two steps to protein synthesis. The first step is called transcription. In this step, the DNA strand is transformed into mRNA  because DNA is too big to pass through the cell membrane because of the double helix. RNA polymerase (enzyme) is used for the processes. This reads 3' to 5'. Then the mRNA goes under RNA processing where the introns ("non-coding" materials) are spliced out with splicesomes. Then the mRNA creates caps on its ends and Poly-A tails so that once out of the cell the important information is not "eaten". Then once out of the cell, the mRNA goes into a ribosome. The ribosome is where the final step happens. This step is called translation. The ribosomes read from 5' to 3'. There are three stations in a ribosome. The start codon is always AUG. The second station is where the anti-codon start attaching the amino acids together with polypeptide bonds. Then once the stop codon is reached, the amino-acids break off, and then the anti-codon exits the ribosome.
   

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