Term
| What do ribosomes catalyze? |
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Definition
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Term
| What does the A site hold? |
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Definition
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Term
| What does the P site hold? |
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Definition
| The tRNA with growing polypeptide attached. |
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Term
| What does the E site hold? |
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Definition
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Term
| What are the three phases of translation? |
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Definition
| Initiation, elongation, termination. |
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Term
| What is the first step of translational elongation? |
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Definition
| An aminoacyl tRNA carrying the correct anticodon for the mRNA codon enters the A (acceptor) site. |
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Term
| What is the second step of translational elongation? |
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Definition
| A peptide bond forms between the amino acid on the aminoacyl tRNA in the A site and the growing polypeptide in the P (peptide-bond-forming) site. |
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Term
| What is the third step of translational elongation? |
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Definition
| The ribosome moves ahead three bases and all three tRNAs move down one position; the tRNA in the E (exit) site exits. |
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Term
| What is needed to hold amino acids and interact with mRNA codons? Why doesn't transcription need this? |
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Definition
| An adapter molecule. Transcription does not need this because NTPs and dNTPs can directly form base pairs. |
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