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Laabri
30.1 - Do First: Protein Synthesis Review
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9
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1.
Mmuae Afoforo a Wobɛpaw:
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The mRNA (or pre-mRNA) contains introns and exons. Splicing removes the introns and joins the exons together.
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The mRNA exits the nucleus through a nuclear pore. Once in the cytoplasm, it associates with a ribosome.
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Free RNA nucleotides attach to the exposed DNA bases and RNA polymerase joins them together to form mRNA.
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Inside the nucleus, DNA is unzipped and RNA polymerase initiates transcription at a promoter sequence.
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24
Asemmisa {{asɛmmisaAhyɛnsode}}
2.
Mmuae Afoforo a Wobɛpaw:
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Each tRNA carries an amino acid - as the tRNA molecules are brought into alignment, the adjacent amino acids bond.
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When a STOP codon is reached, the polypeptide is finished - some proteins are just 1 polypeptide while others have multiple polypeptides.
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The tRNA detaches from its amino acid and leaves the ribosome.
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The mRNA exits the nucleus through a nuclear pore. Once in the cytoplasm, it associates with a ribosome.
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Transfer RNA (tRNA) molecules with the correct anticodons attach to the codons in the mRNA strand.
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The mRNA strand is shifted by one codon and new tRNA molecules attach, building up an amino acid chain ( a polypeptide).
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3.
Complete the diagram by filling in the correct bases and the correct the correct amino acids.
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