DNA,RNA,Protein遗传物质.ppt

DNA, RNA and Protein How the Information in DNA Is Used to Build a Protein DNA and RNA Structure DNA and RNA Structure Nucleotide Chain Nucleotides are joined together by dehydration synthesis DNA Structure Applying Your Knowledge In the DNA double helix, which base is paired with adenine? Adenine Cytosine Guanine Thymine Uracil DNA Replication DNA Replication Applying Your Knowledge After DNA replication, what is the composition of the new double-helical molecules? Two new chains Two old chains One old and one new chain One helix has two new chains and one has two old chains None of these is correct. Building Your DNA Model Transcription = Production of RNA Using DNA as a Template Transcription Applying Your Knowledge What is the sequence of an RNA molecule transcribed from a DNA template strand that reads 3’-ATG-5’? 5’-TAC-3’ 5’-CAU-3’ 5’-AUG-3’ 5’-UAC-3’ 3’-TAC-5’ Products of Transcription Messenger RNA Contains the code words for the sequence of amino acids in a specific protein CODON = group of three nucleotides acting as a code word for an amino acid Products of Transcription Transfer RNA “Translates” the message by bringing a specific amino acid into the correct position on the growing protein chain Has ANTICODON = a group of three nucleotides on a tRNA that recognizes a mRNA codon Has amino acid attachment site Genetic Code Products of Transcription Ribosomal RNA One of the structural components of the ribosome Ribosome = organelle where protein synthesis occurs Has sites to bind both mRNA and tRNA Applying Your Knowledge Which molecule contains the information for assembling the amino acids in the correct order in the protein? rRNA tRNA mRNA All of these None of these Building Your DNA Model Translation Translation Initiation mRNA binds to ribosome First tRNA binds to mRNA Translation Elongation Next tRNA binds to mRNA Translation Elongation Amino acids are joined First