How does DNA create action?

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Presentation transcript:

How does DNA create action? Why do we have DNA? It is a set of instructions that tells our cells/bodies how to function How does DNA create action? It contains information on how to make proteins (proteins do the actual work in a cell) How does protein come from DNA? The process of Protein Synthesis

build proteins Big Idea… cytoplasm ribosome mRNA nucleus

Protein Synthesis: From Gene to Protein

Key Players DNA RNA (3 types) RNA polymerase Ribosomes Amino Acids

Key Processes Transcription Translation

Key Players - RNA Nucleic Acid Structure – similar to DNA Made up of Nucleotides Sugar (ribose) Phosphate group Base (A, U, G or C) Bases attach to sugars

Key Players- RNA Thymine (T) 2 strands Uracil (U) DNA Thymine (T) 2 strands 4 Oxygens per sugar (deoxyribose) Must STAY in nucleus RNA Uracil (U) 1 strand 5 Oxygens per sugar (ribose) Can LEAVE nucleus

Key Players – RNA There are 3 types of RNA mRNA ~(messenger) takes genetic information out of the nucleus

Key Players – RNA tRNA ~(transfer) carries amino acids to mRNA rRNA ~(ribosomal) makes up ribosomes

Key Processes - Transcription Definition ~ making an RNA copy from DNA REMEMBER: Uracil (U) replaces Thymine (T)

DNA unzips in small portions and is read by RNA Polymerase Key Processes - Transcription DNA unzips in small portions and is read by RNA Polymerase

Key Processes - Transcription RNA Nucleotides attach in a complimentary sequence to make a chain of RNA The termination site on the DNA tells the RNA polymerase to detach from the DNA

Key Processes - Transcription The new chain of RNA nucleotides is called mRNA and can now leave the nucleus

Key Processes – Translation Definition – Three types of RNA working together to make proteins using amino acids Important terms: Codon – set of 3 bases on mRNA Anti-codon – set of 3 bases on tRNA (complimentary to a codon)

Key Processes – Translation mRNA leaves the nucleus and attaches to ribosomes (ribosomes are in 2 parts) Ribosomes read mRNA one codon at a time tRNA with the matching anti-codon attaches, bringing with it an amino acid

Key Processes- Translation tRNA attaches its amino acid to the previous amino acid and then leaves Long chains of amino acids are made. A long chain of amino acids is a protein.

Key Processes- Translation The stop codon ends protein synthesis and the new protein leaves the ribosome The proteins determine our traits and also do all the work in our cells.

Key Processes - Translation View this animation on translation: http://youtu.be/NJxobgkPEAo http://youtu.be/d1UPf7lXeO8

Key Processes – Translation Important terms: Stop Codon – tells tRNA to stop making the protein. Signals the end of a chain of amino acids. (UAA, UAG, UGA) Initiator – the first codon in a sequence of mRNA. Tells tRNA where to start making a protein

The Secret Code! Shhh! Original DNA Strand T A C G A A C A T

T A C G A A C A T A U G C U U G U A The Secret Code! Shhh! Transcription: Original DNA Strand mRNA strand T A C G A A C A T A U G C U U G U A

A C U G The Secret Code! Shhh! Translation: mRNA strand Methionine leucine Valine tRNA A C U G

The Secret Code! Shhh! UAC = Tyrosine GAA = Glutamic Acid CAU = Histidine

Practicing the Secret Code 1. GCA Alanine

Practicing the Secret Code 2. AGU Serine

Methionine (Initiator) Practicing the Secret Code 3. AUG Methionine (Initiator)

Practicing the Secret Code 4. CCG Proline

Practicing the Secret Code 5. GGG Glycine