AN EXPERIMENT TO DEVELOP A SIMPLE MODEL OF DNA AND DEMONSTRATE THE PROCESS OF PROTEIN SYNTHESIS Protein Synthesis.

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Presentation transcript:

AN EXPERIMENT TO DEVELOP A SIMPLE MODEL OF DNA AND DEMONSTRATE THE PROCESS OF PROTEIN SYNTHESIS Protein Synthesis

DNA structure DNA is a double strand of nucleotides found mainly in the nucleus. Nucleotides are made up of a sugar, a phosphate group and a nitrogen base (either adenosine, thymine, cytosine or guanine). They form complementary pairs as A only joins with T and G only joins with C. Alternate sugar and phosphate form the sides (like rungs in a ladder) ThymineAdenosine Cytosine Guanine phosphate sugar nucleus

Protein Synthesis The genetic information carried on DNA directs the production of proteins. Proteins are made up of one or more polypeptide chain. These polypeptide chains are made up of a linear sequence of amino acids joined by a peptide bond.

Materials 42 tooth picks representing the bonds between the chemicals 18 milk bottle lollies cut in half (36 halves) representing sugar 18 raspberry lollies (36 halves) representing phosphate units 25 jelly beans halved (5 each of 5 colours) representing bases 4 different jelly snakes 6cm long representing amino acids A4 white paper representing a cell Coloured paper circle, 6cm diameter, representing a ribosome Clean sharp knife Cutting board Gloves Scissors Marking pen Heinemann Biology textbook

The RNA polymerase binds to the prometer.DNA ‘unzips’ in the nucleus

Transcription of the gene occurs (controlled by RNA polymerase). DNA acts as a template to create a single stand of complementary mRNA. Uracil replaces Thymine the base found in DNA. Uracil

mRNA moves out of the nucleus and into the cytoplasm where the ribosomes are present.

Translation: the ribosomes move along the mRNA molecule temporarily paring bases of tRNA anticodons with their complementary triplets of mRNA bases.

The amino acids are linked together by and enzyme to form a polypeptite chain. Polypeptite chain

They then leave their tRNA carriers. The chain may be joined with one or more other polypeptites. It folds into its correct shape which is needed for its particular function forming a protein. protein