ANTHRO 101 Lecture Notes - Lecture 24: East Los Angeles College, Transcription Preinitiation Complex, Transfer Rna
Document Summary
Most genes contain the information for the synthesis of a single protein. Proteins are the molecular workers of the cell, forming many of its cellular structure and the enzymes that catalyze its chemical reactions. Need a flow of info from dna to protein. Dna provides instructions for protein synthesis via rna intermediaries. Dna cannot directly guide protein synthesis because it occurs on ribosomes in the cytoplasm. Ribonucleic acid (rna) = molecule that carries info from dna in nucleus to ribosomes in cytoplasm. Rna structurally differs from dna in three ways: (2) rna has the sugar ribose instead of deoxyribose in its backbone. (3) rna has the base uracil instead of the base thymine. Dna codes for the synthesis of many types of rna. Three of which play specific roles in protein synthesis: Messenger rna carries the code for protein synthesis from dna to ribosomes. Mrna carries the code for the amino acid sequence of a protein from dna to the.
