plumiThe genetic code and genes: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 2.5.1 The genetic code and genes, 2019–2025, with mark schemes and examiner’s reports where available.
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Q6(b)(i)
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All 18 questions on The genetic code and genes, as a list
- June 2025, Unit 4, Q6(b)(i) (1 mark): Which is the mean number of bases in the template (antisense) strand of one region that codes for a protein? (1) A 239 B 476 C 714 D 1 429
- June 2025, Unit 4, Q6(b)(ii) (2 marks): Suggest two reasons why this DNA contains more than 150 000 base pairs. (2)
- June 2024, AS Unit 1, Q3(b) (3 marks): Compare and contrast the structure of the start and stop codons and how they work. (3)
- January 2024, AS Unit 1, Q2(a) (2 marks): Triplet code (2)
- January 2024, AS Unit 1, Q2(b) (2 marks): Non-overlapping code (2)
- January 2024, AS Unit 1, Q2(c) (2 marks): Degenerate code (2)
- June 2023, AS Unit 1, Q5(c)(i) (1 mark): Variegin is a peptide consisting of 32 amino acids. Which is the minimum number of bases in the gene that codes for this peptide? (1) A 32 B 33 C 96 D 99
- January 2023, Unit 5, Q8(e) (2 marks): Explain what is meant by the phrase ‘mitochondrial proteome’ (paragraph 7). (2)
- January 2022, AS Unit 1, Q4(a) (1 mark): Give the meaning of the term gene. (1)
- January 2022, AS Unit 1, Q8(a)(i) (1 mark): Give the seventh triplet code in the gene for the β‑globin chain in a person who has sickle cell disease. (1)
- October 2020, AS Unit 1, Q6(a) (6 marks): Explain the nature of the genetic code. Use information in the table to support your answer. (6)
- October 2020, AS Unit 1, Q6(b)(i) (1 mark): Give the sequence of amino acids that is coded for by these bases. (1)
- October 2020, AS Unit 1, Q6(b)(ii) (5 marks): Explain the possible effects on a protein if there is a substitution mutation in the 9th base in this DNA strand. Use information in the table to support your a
- June 2019, AS Unit 1, Q3(a)(i) (1 mark): Complete the diagram to show the sequence of amino acids coded by this DNA base sequence. (1)
- June 2019, AS Unit 1, Q3(a)(ii) (2 marks): Explain why only five amino acids are coded by this sequence of bases. (2)
- June 2019, AS Unit 1, Q3(b) (3 marks): Explain why some amino acids, such as alanine, have more than one genetic code. (3)
- June 2019, AS Unit 1, Q3(c)(i) (1 mark): Calculate the percentage of genetic codes that code for amino acids. Give your answer to four significant figures. (1) Answer %
- June 2019, AS Unit 1, Q3(c)(ii) (2 marks): Explain the role of the other three genetic codes. (2)
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