Transcription and Translation
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Transcript of Transcription and Translation
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Transcription and Translation
The Central Dogma of Biology
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How does DNA make us who we are?
By making proteins! DNA contains the instructions for which proteins to make
*and complicated instructions on when to make them that we don’t fully understand
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We Differ in our Protein Make Up
I.e. difference in pigments (hair, eye, skin etc.)
I.e. difference in enzymes (make different amounts of molecules)
I.e. difference in antibodies (some get sick more often or from different things)
*A lot of differences are also due to more complicated gene expression
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Different Alleles Code for slightly
different versions of the protein
Probably arose through mistakes in DNA replication
Makes a white protein in flowers
Makes a purple protein in flowers
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Transcription DNA-> mRNA Like making a copy
of the blueprint Kind of like DNA
replication- complementary nucleotides are added- EXCEPT U is used instead of T
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RNA vs. D
NA
DNARNA
Deoxyribose sugar A,C, G and T nucleotides Usually double stranded Stores the code (like the
master blueprint) Ribose sugar A, C, G and U nucleotides Usually single stranded
› But can fold on itself Different types and functions
› mRNA, tRNA, rRNA› Carries code, assembles proteins
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Accomplished by RNA polymerase
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Where does it happen? Each gene has
a promoter Transcription
factors help RNA polymerase bind to the promoter and begin transcription
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Example – promoter=TATAA
AGCTATAACGACG T TAGCATCAT CGATAT T GCT GCAATCGTAGTT CGATAT T GCT GCAATCGTAGT
DNARNA polymerase
GCUGCAAUCGUAGU
mRNA
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Mr. Mahon’s Pet peeve
DNA is not turned into RNA!
An RNA molecule is made based of the DNA code!
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Translation mRNA Protein in the ribosome
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Basics of Translation Every 3 RNA nucleotides (letters) codes
for 1 amino acid› Called a “codon”
Example:DNA ATG GCA GACRNA UAC CGU CUGProtein Tyr Arg Leu
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How? A tRNA molecule carries an amino acid tRNA nucleotides must be complementary
to mRNA code
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tRNA (transfer RNA)
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Codon Table
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Beginning and End Translation always begins at the Start
Codon AUG and ends when a STOP codon is reached
Ex. RNA GTCA AUG GCC CCA UGG Protein Met – Ala - Pro
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Translation Animation
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Review Transcription
› DNA (gene) transcribed to make mRNA which carries code
› In Nucleus Translation
› mRNA code translated into a protein
› With help of tRNA in the ribosome