IB Biology HL 3.1.11 Haemoglobin Adaptations Question Bank

Practise IB Biology HL 3.1.11 through exact HL questions on haemoglobin structure, cooperative oxygen binding, fetal curves and altitude or diving adaptation.

Exam points

Analyse haemoglobin adaptations using haem groups, cooperative binding and oxygen-affinity curves.
Use fetal, altitude or diving evidence to explain how affinity changes oxygen loading and unloading.
Relate haemoglobin structure to reversible transport of oxygen and carbon dioxide in blood.

[Maximum number: 2]

Oxygen dissociation curves show the percentage of oxygen saturation of adult haemoglobin (Hb) at different oxygen concentrations, as measured in partial pressure of oxygen ( $\mathrm{pO}_{2}$ ).

Figure for Question B3.1.11 (HL)—Haemoglobin adaptations question 1 — IB Biology HL

(a)

On the graph, sketch an oxygen dissociation curve for foetal haemoglobin.

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curve should be the sigmoidal and drawn to the left of the oxygen dissociation curve;

Labels not necessary.

Not necessary that curves meet at high $\mathrm{pO}_{2}$ .

(b)

Describe an adaptation of haemoglobin for the transport of oxygen.

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B3.1.11 (HL)—Haemoglobin adaptations question 1

Question (a)

Question (b)