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DNA Structure
The Flow of Genetic Information
from DNA to RNA to Protein
– DNA functions as the inherited directions
for a cell or organism.
Copyright © 2007 Pearson Education, Inc. publishing as Pearson Benjamin Cummings
From Nucleotides to Amino
Acids: An Overview
– Genetic
information in
DNA is
transcribed into
RNA and then
translated into
polypeptides
(proteins).
Transcription: From DNA to RNA
– In transcription,
• Genetic information is transferred from DNA to
RNA.
• RNA polymerase is the enzyme for the job.
Messenger RNA (mRNA)
– What are the rules
for translating the
RNA message into
a polypeptide?
– Triplets of bases
• Specify all the
amino acids.
• Are called codons.
The Genetic Code
– A fully assembled ribosome holds tRNA
and mRNA for use in translation.
http://www.youtube.com/watch?v=TSv-Rq5C3K8
Start at min 3:00
Review: DNA RNA Protein
Copyright © 2007 Pearson Education, Inc. publishing as Pearson Benjamin Cummings
RNA polymerase
Ribosome