| Date | May 2015 | Marks available | 4 | Reference code | 15M.3.SL.TZ2.3 |
| Level | Standard level | Paper | Paper 3 | Time zone | Time zone 2 |
| Command term | Explain | Question number | 3 | Adapted from | N/A |
Question
State two symptoms of type II diabetes.
[2]
a .
Explain the causes and consequences of phenylketonuria (PKU).
[4]
b.
Markscheme
a. glucose in urine;
b. high blood glucose;
c. frequent urination / dehydration/excess thirst;
d. constant hunger;
e. weight loss;
f. tiredness;
a .
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;
b.
Examiners report
Questions 2 and 3 were well answered with better candidates gaining near perfect marks.
a .
Questions 2 and 3 were well answered with better candidates gaining near perfect marks.
b.
Syllabus sections
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