2005_campbl17 - Important Point Flow of Information DNA DNA...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Chapter 17: From Gene to Protein Important Point: Flow of Information ± DNA Æ DNA = Replication ± DNA Æ RNA = Transcription ± RNA Æ Protein = Translation ± RNA Æ DNA = Reverse Transcription ± Protein Æ RNA or DNA: DOES NOT HAPPEN! ± Nucleic acid sequence is most readily translated into protein sequence ± But protein sequence cannot be translated into nucleic acid sequence ± In other words, information flows from Nucleic Acid Sequence to Protein Sequence ± Information flows from Genotype to Phenotype ± Mutation and Natural Selection supplies the means by which protein sequence can influence nucleic- acid sequence “The DNA inherited by an organism leads to specific traits by dictating the synthesis of certain proteins. Proteins are the links between genotype and phenotype.” Information Flow
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Roles of Central Players ± A codon is a sequence of three nucleotides ± mRNA is the molecule that presents codons to ribosomes ± DNA serves as a codon-storage molecule ± DNA serves as a template for RNA synthesis ± Ribosomes translate codons, in sequence, into chains of amino-acids (polypeptides) ± These amino-acid (and RNA) sequences are precisely controlled ± Precision is both costly and requires complex machinery to achieve ± Once translated, proteins also are often post- translationally modified ± Proteins consist of one or more polypeptide Triplet Code Genetic Code 61 sense codons for 20 amino acids Note the degeneracy
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 06/03/2011 for the course BIO 113 taught by Professor Swenson during the Spring '08 term at Ohio State.

Page1 / 8

2005_campbl17 - Important Point Flow of Information DNA DNA...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online