Translation is the second stage of protein synthesis where your...
Biology453 views·Updated 1 Sept 2026·2 pagesGenetics Translation Notes for AQA A-Level Biology
Maya A@maya.ah
1
of 2
How Translation Gets Started
Translation kicks off when a ribosome attaches to the start codon (AUG) on an mRNA molecule in your cell's cytoplasm. This is like finding the "start here" instruction on a complex assembly manual.
Here's where it gets clever: tRNA molecules act as delivery trucks, each carrying a specific amino acid and sporting a unique anticodon that matches perfectly with codons on the mRNA. The first tRNA with anticodon UAC pairs up with the start codon, delivering methionine as the first amino acid.
The ribosome works like a molecular factory, holding two tRNA molecules at once whilst they pair up with their corresponding codons. Once positioned correctly, the amino acids get joined together by a peptide bond - this reaction needs energy from ATP to make it happen.
Key Point: Each tRNA has its own specific anticodon and carries only one type of amino acid, ensuring proteins are built with perfect accuracy.
2
of 2
Building the Protein Chain
The ribosome moves along the mRNA like a scanner, reading each codon in sequence and adding up to 15 amino acids per second. As it shifts to the next codon, the previous tRNA gets released and can collect another amino acid from the cell's amino acid pool - it's like a recycling system.
Multiple ribosomes can work on the same mRNA simultaneously, with up to 50 ribosomes trailing behind each other. This polyribosome setup means your cells can mass-produce identical proteins incredibly efficiently.
Translation stops when the ribosome hits a stop codon, causing everything to separate and release the completed polypeptide chain. The chain then folds into its secondary and tertiary structures, and may combine with other polypeptides to form the final functional protein.
Remember: The DNA sequence determines the mRNA codons, which determine the tRNA order, which determines the amino acid sequence - it's a perfect chain of genetic information transfer.
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Biology453 views·Updated 1 Sept 2026·2 pagesGenetics Translation Notes for AQA A-Level Biology
Maya A@maya.ah
Translation is the second stage of protein synthesis where your cells actually build proteins using the genetic instructions from mRNA. Think of it like following a recipe - the mRNA provides the instructions, and special molecules called tRNA deliver the...
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of 2
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How Translation Gets Started
Translation kicks off when a ribosome attaches to the start codon (AUG) on an mRNA molecule in your cell's cytoplasm. This is like finding the "start here" instruction on a complex assembly manual.
Here's where it gets clever: tRNA molecules act as delivery trucks, each carrying a specific amino acid and sporting a unique anticodon that matches perfectly with codons on the mRNA. The first tRNA with anticodon UAC pairs up with the start codon, delivering methionine as the first amino acid.
The ribosome works like a molecular factory, holding two tRNA molecules at once whilst they pair up with their corresponding codons. Once positioned correctly, the amino acids get joined together by a peptide bond - this reaction needs energy from ATP to make it happen.
Key Point: Each tRNA has its own specific anticodon and carries only one type of amino acid, ensuring proteins are built with perfect accuracy.
2
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Building the Protein Chain
The ribosome moves along the mRNA like a scanner, reading each codon in sequence and adding up to 15 amino acids per second. As it shifts to the next codon, the previous tRNA gets released and can collect another amino acid from the cell's amino acid pool - it's like a recycling system.
Multiple ribosomes can work on the same mRNA simultaneously, with up to 50 ribosomes trailing behind each other. This polyribosome setup means your cells can mass-produce identical proteins incredibly efficiently.
Translation stops when the ribosome hits a stop codon, causing everything to separate and release the completed polypeptide chain. The chain then folds into its secondary and tertiary structures, and may combine with other polypeptides to form the final functional protein.
Remember: The DNA sequence determines the mRNA codons, which determine the tRNA order, which determines the amino acid sequence - it's a perfect chain of genetic information transfer.
We thought you’d never ask...
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
You can download the app from Google Play Store and Apple App Store.
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