Thursday, March 1, 2012

Great job on the DNA quiz. The averages for all periods was between an 83-88 percent!

Today you should have finished your Bio2Go on protein synthesis in class. Tomorrow we will take notes on protein synthesis. This is a fairly detailed process to remember.

DNA has the direction on how to make a protein. Remember that DNA can't fit out through a nuclear pore, so it stays int he nucleus. mRNA copies DNA and brings the directions on how to make a protein out to the ribosomes in the cytoplasm.  It is here, that tRNA reads the codons on mRNA. The codons are a series of 3 nitrogen bases.  tRNA has the anticodons to match up to the codons. Each codon codes for a different amino acid. It is tRNA that brings in the amino acids to the ribosomes.  Proteins are simply chains of amino acids and there are 20 amino acids.

Below is a diagram of a protein being made.  You can see the long mRNA chain on the ribosomes. The tRNA molecule is bringing in the amino acids. See the chain being formed?