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

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

3. 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

4. mRNA

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

6. 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

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

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

9. 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

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

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