BIOL140 Lecture Notes - Lecture 10: Stop Codon, Ribosome, Start Codon

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21 Jun 2016
Department
Course
Professor
Gene Expression
Transcription Translation
Genetic Code
A)
Mechanism that translates the 4-base DNA into the twenty amino acids
DNA = TAC
Amino Acid= Methionine (MET)
Ex.
Triplets of nucleotides refer to/ code for an amino acid
Codes for Amino Acids
Triplets- codons- mRNA
Several codons code for the same amino acid
Called Redundancy
Allows for small changes in DNA to not affect the final protein
Some amino acids have more than one codon
Transcription
B)
Building mRNA based on the DNA Template
Gene-instructions for proteins
DNA opens along a particular segment of the chromosomes
1.
DNA= A T C G
mRNA= U A G C
Free RNA nucleotides
2.
P - S backbone forms on mRNA
3.
mRNA is released from the nucleus
4.
DNA strands re-bond together
5.
Processed in nucleus
mRNA Is unprocessed
6.
Steps
unprocessed
Intron-not for Protein
Exon-instructions for
making protein
Processed mRNA
Processed mRNA leaves the Nucleus
7.
Diagram of Transcription
DNA- TAC GGG CCA AGC ATC
mRNA- AUG CCC GGU UCG UAG
Acids- MET PRO Gly Ser Stop
Translation
C)
Based on mRNA Template
Building primary structure of protein
Correct
Not correct
Lecture Ten
October 30, 2015
8:26 PM
BIO 140 Page 1
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