logging in or signing up RNA & Transcription PowerPoint cavalierem Download Post to : URL : Related Presentations : Let's Connect Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 195 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: April 17, 2013 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript PowerPoint Presentation: Protein Synthesis Part 1 Transcription RNA AndPowerPoint Presentation: DNA contains genes , sequences of nucleotide bases . These genes code for proteins. Proteins are used to build cells and do much of the work inside cells. Examples of proteins include enzymes , pigments, and antibodies ! Deoxyribonucleic AcidPowerPoint Presentation: Proteins are made of amino acids linked together by peptide bonds. 20 different amino acids exist. Genes & ProteinsPowerPoint Presentation: DNA is found inside the nucleus . Proteins, however, are made in the cytoplasm of cells by organelles called ribosomes. Ribosomes may be free in the cytoplasm or attached to the surface of rough ER . DNA Begins the ProcessPowerPoint Presentation: DNA’s code is copied and taken to the cytoplasm by a type of RNA (Ribonucleic Acid) called mRNA. In the cytoplasm, this code carried by mRNA must be read so amino acids can be assembled to make proteins. This process is called PROTEIN SYNTHESIS . RNA Continues the ProcessPowerPoint Presentation: 1. RNA has the sugar ribose . DNA has the sugar deoxyribose. 2. RNA has the base uracil (U). DNA has the base thymine (T). 3. RNA molecule is single-stranded . DNA molecule is double-stranded. Ribose vs. Deoxyribose RNA Differs from DNAPowerPoint Presentation: Structure of RNAPowerPoint Presentation: Messenger RNA (mRNA) copies DNA’s code & carries the genetic information to the ribosomes. Ribosomal RNA (rRNA) , along with protein, makes up the ribosomes. Transfer RNA (tRNA) transfers amino acids to the ribosomes where proteins are synthesized. Three Types of RNAPowerPoint Presentation: messenger RNA mRNA is a single-stranded RNA molecule that carries the instructions from a gene to make a protein. Contains the Nitrogen Bases A, G, C, U ( no T ). In eukaryotic cells, mRNA carries the genetic “message” from DNA in the nucleus to the ribosomes in the cytoplasm.PowerPoint Presentation: Now that we know all about RNA , let’s make some proteins ! This order of events is called the central dogma of molecular biology : DNA RNA P R O T E I N Makin’ ProteinsPowerPoint Presentation: Occurs in TWO stages: Transcription Translation Makin’ ProteinsPowerPoint Presentation: Transcription 6 Steps The process by which the genetic instructions in a specific gene are transcribed or “rewritten” into an RNA molecule. Takes place in the nucleus of eukaryotic cells.PowerPoint Presentation: RNA Transcription Step 1: A special enzyme called RNA polymerase attaches to the DNA at the promoter , the starting point in the DNA for transcription. Hydrogen bonds between base pairs break and DNA “ unzips ”PowerPoint Presentation: RNA Transcription Step 2: DNA strands pull apart from each otherPowerPoint Presentation: RNA Transcription Step 3 : RNA polymerase finds RNA nucleotides in the cell and matches them up with only one side of the “unzipped” DNA The “unzipped’ strand forms a template (a model) for making an mRNA strand RNA nucleotidePowerPoint Presentation: RNA Transcription Step 4 : RNA polymerase continues to match up nucleotides with “unzipped” DNA until it reaches a point in the DNA called the termination signal that says “ STOP !” The termination signal is a specific sequence of nucleotides that marks the end of a gene. mRNA strand One side of DNA strandPowerPoint Presentation: RNA Transcription Step 5 : mRNA strand breaks off from the DNA strand and leaves the nucleus for the ribosome mRNA strandPowerPoint Presentation: RNA Transcription Step 6: Once the mRNA leaves, the DNA “ zips ” back together!PowerPoint Presentation: After the newly made mRNA leaves the nucleus, it attaches to a ribosome where it will direct translation, the second stage of protein synthesis. 1 2 3 After TranscriptionPowerPoint Presentation: Try it! What RNA strand will be made from the following DNA sequence? TACGCATGACTAGCAAGTCTAACT TranscriptionPowerPoint Presentation: Try it! What mRNA strand will be made from the following DNA sequence during transcription? DNA: TACGCATGACTAGCAAGTCTAACT mRNA: AUGCGUACUGAUCGUUCAGAUUGA TranscriptionPowerPoint Presentation: Each 3 nucleotide sequence in mRNA is called a codon and codes for a specific amino acid. Now, divide your mRNA into codons: mRNA: AUGCGUACUGAUCGUUCAGAUUGA mRNA codons : AUG-CGU-ACU-GAU-CGU-UCA-GAU-UGA CodonsPowerPoint Presentation: Watch this animation: http://www.stolaf.edu/people/giannini/flashanimat/molgenetics/transcription.swf Transcription You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.