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6 Cards in this Set
- Front
- Back
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Transcription Stage 1: Initiation |
A section of DNA known as the promoter referred to as a TATA box indicates where transcription begins. |
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Transcription Stage 2: Elongation |
RNA polymerase assembles nucleotides that complement one of the DNA strands called the template strand
RNA polymerase reads the template strand in a 3' to 5' direction and lays down complimentary nucleotides in a 5' to 3' direction
The Strand that is produced is called the pre-mrna
Elongation involves proofreading mechanisms which can replace incorrectly Incorporated bases |
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Transcription stage 3: Termination |
A series of nucleotides signal termination
a poly a tail is formed and make sure termination doesn't happen too early
The removal of non coding segments leaves axons which are join together
This leaves a mature mRNA strand which leaves the nucleus to begin Translation
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Translation stage 1: Initiation |
The MRNA binds to a small subunit of the ribosome
Upon Binding of the mRNA, TRNA (transfer RNA) carries the first amino acid to the ribosome and attaches it to start codon
The start codon is composed of the sequence AUG
Every three nucleotides former code on from the start codon
Once attached to the start codon the large subunit of the ribosome attaches The lodge subbed unit has 3 TRNA binding sites e, p and a sites Incoming TRNA binds to the a side of the ribosome The p site holds the TRNA that carries the growing peptide chain Each codon codes for a particular amino acid depending on the basis which compose them the start codon Aug enters the p site |
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Translation Stage 2: Elongation |
A TRNA with her complementary anticodon go to the next code on on under MRNA located within the a side of the ribosome Peptide bond forms between the two amino acids that are attached to the two trna's Each MRNA codon and it's associated TRNA shift to the next site within the ribosome The use TRNA located within the Eastside is released The process is continually repeated and a protein folds as it is formed |
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Translation stage 3: termination |
When a stop codon is reached ( UGA, UAA or UAG ) an enzyme cleaves the polypeptide from the last TRNA The protein, TRNA, MRNA and ribosomal subunits separate Often the start codon methionine is removed |
