The Nucleus - Below: A ribosome attaches to the mRNA...

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The Nucleus DNA is located in an organelle called the nucleus . Transcription and mRNA processing occur in the nucleus. The nucleus is surrounded by a double membrane. After the mature mRNA transcript is produced, it moves out of the nucleus and into the cytoplasm through pores in the nuclear membrane . Translation Translation is the process where ribosomes synthesize proteins using the mature mRNA transcript produced during transcription . Overview The diagram below shows a ribosome attach to mRNA, and then move along the mRNA adding amino acids to the growing polypeptide chain. Translation - Details A mature mRNA transcript, a ribosome, several tRNA molecules and amino acids are shown. There is a specific tRNA for each of the 20 different amino acids.
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Unformatted text preview: Below: A ribosome attaches to the mRNA transcript. A tRNA molecule transports an amino acid to the ribosome. Notice that the 3-letter anticodon on the tRNA molecule matches the 3-letter code (called a codon ) in the mRNA. The tRNA with the anticodon "UAC" bonds with methionine. It always transports methionine. Transfer RNA molecules with different anticodons transport other amino acids. A second tRNA molecule bonds to the mRNA at the ribosome. Again, the codes must match A bond is formed between the two amino acids. The tRNA bonded to methionine drops off and can be reused later. The ribosome moves along the mRNA to expose another codon (GAU) for a tRNA molecule....
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This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.

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The Nucleus - Below: A ribosome attaches to the mRNA...

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