Nucleic Acids and Protein Synthesis. CENTRAL DOGMA DNA RNA Protein Trait.

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Nucleic Acids and Nucleic Acids and Protein Synthesis Protein Synthesis

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Transcript of Nucleic Acids and Protein Synthesis. CENTRAL DOGMA DNA RNA Protein Trait.

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  • Nucleic Acids and Protein Synthesis
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  • CENTRAL DOGMA DNA RNA Protein Trait
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  • DNA TO PROTEINS DNA is the blueprint for life it contains your genetic information The order of the bases in a segment of DNA (Gene) codes for a particular protein; these proteins then determine your traits How do you get from a 4-letter code to an entire organism? A GENE IS A SEGMENT OF DNA THAT CODES FOR A PROTEIN. NOT ALL DNA CODES FOR PROTEINS.
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  • DNA TO RNA: TRANSCRIPTION In the first step of protein synthesis, the code of DNA is transcribed onto a molecule of RNA this step of the process is known as Transcription DNA is too big and too sensitive to leave the nucleus. However, proteins are made in the ribosomes, so the information in DNA must be transferred. It will be transferred to a molecule of RNA RNA is also used because it allows the genetic information to move from the nucleus (safe) to the cytoplasm (dangerous)
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  • RNA RNA = Ribonucleic acid RNA = Ribonucleic acid It is still a nucleic acid therefore it is made up of nucleotides (3 components: sugar, phosphate group and nitrogen bases) It is still a nucleic acid therefore it is made up of nucleotides (3 components: sugar, phosphate group and nitrogen bases) It uses ribose as its sugar It uses ribose as its sugar Instead of using thymine, it uses uracil (A, U, G, C) Instead of using thymine, it uses uracil (A, U, G, C) It is a single strand only It is a single strand only
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  • Types of RNA - mRNA Messenger RNA (mRNA): single uncoiled chain that carries the genetic information from the nucleus to the cytosol Messenger RNA (mRNA): single uncoiled chain that carries the genetic information from the nucleus to the cytosol
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  • Types of RNA - tRNA Transfer RNA (tRNA): single chain in the formation of a hairpin shape, each piece is bound to a specific amino acid
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  • Types of RNA - rRNA Ribosomal RNA (rRNA): most abundant form, wraps around ribosomal proteins to make up the ribosomes where proteins are made
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  • Transcription Process by which genetic information is copied (transcribed) from DNA to RNA Process by which genetic information is copied (transcribed) from DNA to RNA RNA polymerase initiates transcription by binding to a specific area of DNA called promoters RNA polymerase initiates transcription by binding to a specific area of DNA called promoters What do you think a promoter is? What do you think a promoter is? A promoter starts, or promoters the beginning of transcription A promoter starts, or promoters the beginning of transcription Where the polymerase binds, the DNA strands separate and a template is created upon which RNA is created Where the polymerase binds, the DNA strands separate and a template is created upon which RNA is created
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  • Transcription (continued) RNA polymerase attaches to the first nucleotide and adds on complementary bases using uracil instead of thymine RNA polymerase attaches to the first nucleotide and adds on complementary bases using uracil instead of thymine Continues until the polymerase reaches the termination signal Continues until the polymerase reaches the termination signal What do you think a termination signal does? What do you think a termination signal does? Termination signal causes the polymerase to release the DNA and RNA Termination signal causes the polymerase to release the DNA and RNA
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  • Protein Synthesis When mRNA is produced it will be used in protein synthesis or the production of proteins When mRNA is produced it will be used in protein synthesis or the production of proteins Proteins consist of polypeptides which consist of amino acids Proteins consist of polypeptides which consist of amino acids There are 20 possible amino acids There are 20 possible amino acids
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  • Translation: Protein Assembly This process takes the information that was transcribed into mRNA and translates it into a protein This process takes the information that was transcribed into mRNA and translates it into a protein It begins when a piece of mRNA attaches to a ribosome It begins when a piece of mRNA attaches to a ribosome mRNA is read by the ribosome. It is read in segments of 3 letters called codons mRNA is read by the ribosome. It is read in segments of 3 letters called codons Each codon codes for a specific amino acid. That amino acid is brought by a piece of tRNA which transfers amino acids. Each codon codes for a specific amino acid. That amino acid is brought by a piece of tRNA which transfers amino acids. tRNA is also read in segments of 3 letters called anticodons. The anticodon is complementary to the codon found on mRNA ( i.e. if the codon is AUG the anticodon is UAC) tRNA is also read in segments of 3 letters called anticodons. The anticodon is complementary to the codon found on mRNA ( i.e. if the codon is AUG the anticodon is UAC) Eventually a stop codon is reached. They do not code for amino acids. They tell the ribosome to stop adding amino acids. Eventually a stop codon is reached. They do not code for amino acids. They tell the ribosome to stop adding amino acids. Many ribosomes may work at once on one piece of mRNA Many ribosomes may work at once on one piece of mRNA
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  • Genetic Code Correlation between nucleotides and amino acids Correlation between nucleotides and amino acids Codon: 3 mRNA nucleotides; codes for a specific amino acid Codon: 3 mRNA nucleotides; codes for a specific amino acid One codons codes to start (AUG amino acid Methionine) and 3 codons can stop (UAA, UAG, UGA no amino acids) One codons codes to start (AUG amino acid Methionine) and 3 codons can stop (UAA, UAG, UGA no amino acids) If you had a codon AAG, what amino acid would you have? If you had a codon AAG, what amino acid would you have? lysine lysine