IB Biology SL 2.5.7 Phenylketonuria and diet Question Bank
Practise IB Biology SL 2.5.7 by explaining PKU and how diet reduces its consequences.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Explain the genetic or biochemical cause of PKU.
- Describe how dietary treatment reduces the effects of PKU.
D3.2.7—Phenylketonuria (PKU) question 1
[Maximum number: 4]
Explain the causes and consequences of phenylketonuria (PKU).
a. (point) mutation of gene;
b. defective enzyme/phenylalanine hydroxylase (PAH);
c. phenylalanine/Phe not broken down to tyrosine/Tyr;
d. phenylalanine/Phe accumulates;
e. (if not treated) symptoms mental retardation/seizures;
f. diet free of phenylalanine/Phe to avoid symptoms;
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