Pearson Edexcel IAL Biology 2.11 Genetic code
Practise applying the triplet, non-overlapping and degenerate nature of the genetic code to codons, amino acids and base counts.
- Syllabus
- First assessment 2019
- Course
- Biology YBI11
- Level
- AS
Exam points
- explain why three bases are needed to provide enough codes for amino acids
- use codon tables to link triplets with amino acids and degenerate alternatives
- calculate minimum base numbers from peptide length, including a stop codon where required
2.11—Genetic code question 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.
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.
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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