What is DNA’s Function? Contains coded instructions for inherited traits Contains code for making Proteins (controls the production of proteins)

Where are proteins made in a cell? Proteins are made at the ribosomes Nucleus Vacuole Ribosomes Cell membrane

DNA does not leave the nucleus because its to big DNA code The mRNA delivers the code to the ribosomes Think of mRNA as Messenger DNA like a mail man mRNA Ribosomes

mRNA

How mRNA is different from DNA Bases A – T G - C (Instead of T , RNA contains a U. It still has A.)

Steps in protein synthesis DNA untwists and unzips mRNA is copied off DNA in the nucleus 3. mRNA then takes code to ribosomes DNA re-zips RNA Transcription

An Example of transcription DNA strand TAC CGA CCT TCA mRNA ___ ____ ____ ____ Remember U instead of T AUG GCU GGA AGU

Step 5 mRNA brings code to ribosome mRNA leaves the nucleus and brings code to ribosome were proteins will be made

Step 6- Translation In Ribosomes mRNA tells ribosomes which amino acids are needed to make protein Remember: 3 letters for one amino acid AMINO ACID tRNA mRNA In Ribosomes

Step 7 Protein is created from sequence of amino acids Remember order of amino acids determines type of protein which determines shape.

An example of translation DNA strand TAC CGA CCT TCA mRNA ___ ____ ____ ____ Protein ____ ____ ____ _____ (Amino acid sequence) AUG GCU GGA AGU __ __ __ MET ALA GLY SER