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Date May 2017 Marks available 1 Reference code 17M.3.SL.TZ1.17
Level Standard level Paper Paper 3 Time zone Time zone 1
Command term Outline Question number 17 Adapted from N/A

Question

Breastfed infants with rickets sometimes have seizures due to low blood calcium levels. A study was carried out to investigate the relationship between maternal blood vitamin D levels and the incidence of these infant seizures.

Describe the relationship between the maternal blood vitamin D levels and the incidence of seizures.

[1]
a.i.

Deduce the reason for rickets in these infants.

[1]
a.ii.

Identify the reason for vitamin D not being considered to be a typical vitamin.

[1]
b.

Outline the reason for some amino acids being classified as essential amino acids.

[1]
c.

Markscheme

infants from mothers with low levels of vitamin D have an increased chance of developing seizures

Accept answers in the converse.

a.i.

lack of vitamin D in breast milk OR lack of vitamin D leads to lack of bone mineralization/calcium uptake

a.ii.

it can be synthesized by humans «in skin»

b.

a. they cannot be synthesized by humans 

b. they must be present in the diet

c.

Examiners report

[N/A]
a.i.
[N/A]
a.ii.
[N/A]
b.
[N/A]
c.

Syllabus sections

Option D: Human physiology » Option D: Human physiology (Core topics) » D.1 Human nutrition
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