Edexcel A-Level Biology AS 2.11 Genetic Code Questions

Use codon tables to translate triplets, explain why the code is triplet, non-overlapping and degenerate, and calculate base requirements for peptide-coding genes.

Syllabus
First assessment 2019
Course
Biology YBI11
Level
AS

Exam points

  • Explain triplet, non-overlapping and degenerate properties of the genetic code.
  • Use codon tables to link DNA or RNA triplets with amino acids and identify sequences.
  • Calculate minimum coding-base numbers, including start or stop codons where required.

Edexcel A-Level Biology AS 2.11 Genetic Code Questions question 1

[Maximum number: 1]

Stents are used in the treatment of atherosclerosis.
Stents widen the diseased coronary artery so that blood can flow through to the heart muscle.

The diagram shows a stent.

Figure for Question Edexcel A-Level Biology AS 2.11 Genetic Code Questions question 1 — Edexcel A-Level Biology AS

Stents can damage the endothelial cells lining the artery and trigger the formation of a blood clot.

Patients who have a stent fitted are given anticoagulants.

The photograph shows a tropical bont tick.

Figure for Question Edexcel A-Level Biology AS 2.11 Genetic Code Questions question 1 — Edexcel A-Level Biology AS

This bont tick produces a peptide called variegin.
Variegin binds to the active site of thrombin and prevents blood clotting.

Variegin is a peptide consisting of 32 amino acids.

Which is the minimum number of bases in the gene that codes for this peptide?

A

32

B

33

C

96

D

99

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