21 exam-style questions · Biology only (B): not in Science (Double Award). Write your answer, check it against the mark scheme and tick the points you earned. Your marks stay on this device. Your writing is not saved.
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4.18B Protein synthesis
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Describe how a protein is made from the information in a gene.
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Total for this question: 4 marks
4.18B Protein synthesis
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What is a codon?
(1)Total for this question: 1 mark
4.18B Protein synthesis
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Explain why the genetic code is described as a triplet code.
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Total for this question: 2 marks
4.18B Protein synthesis
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A gene has 1 200 bases in its coding sequence. Calculate the number of amino acids in the protein.
(2)Total for this question: 2 marks
4.18B Protein synthesis
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Describe transcription.
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Total for this question: 2 marks
4.18B Protein synthesis
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Describe translation.
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Total for this question: 2 marks
4.18B Protein synthesis
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State where translation takes place.
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Total for this question: 1 mark
4.18B Protein synthesis
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Illustrative codon table (simplified).
| Codon | Amino acid |
|---|---|
| AUG | Met |
| GCU | Ala |
| UUC | Phe |
| GGA | Gly |
| UAA | stop |
Use the table to give the amino acid sequence coded by the mRNA AUGUUCGGAGCUUAA.
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Total for this question: 2 marks
4.18B Protein synthesis
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| Codon | Amino acid |
|---|---|
| AUG | Met |
| GCU | Ala |
| UUC | Phe |
| GGA | Gly |
| UAA | stop |
Explain what would happen to the protein if the codon UUC were changed to UAA.
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Total for this question: 2 marks
4.18B Protein synthesis
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Explain why the order of amino acids determines the shape of a protein.
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Total for this question: 2 marks
4.18B Protein synthesis
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Explain how a gene determines the shape of an enzyme's active site.
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Total for this question: 3 marks
4.18B Protein synthesis
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Where does transcription occur?
(1)Total for this question: 1 mark
4.18B Protein synthesis
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Explain why one tRNA molecule carries only one type of amino acid.
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Total for this question: 2 marks
4.18B Protein synthesis
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Suggest why cells that make a lot of protein have many ribosomes.
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Total for this question: 2 marks
4.18B Protein synthesis
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Describe the role of the anticodon.
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Total for this question: 2 marks
