Lesson 3.1.2c
3.1.2c Haemoglobin and oxygen transport Quiz: OCR Biology, Unit 2
20 questions
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Lesson 3.1.2c, Haemoglobin and oxygen transport: 20 multiple choice questions for the OCR Biology (H020), Unit 2: Exchange and transport, written with Revision Ninja.
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The 20 questions
-
Which group within haemoglobin binds reversibly to oxygen molecules?
- Globin chain
- Disulphide bridge
- Peptide bond
- Haem group
-
In which form is most carbon dioxide transported in human blood plasma?
- Carbaminohaemoglobin
- Dissolved gas
- Carbonic acid
- Hydrogencarbonate ions
-
What compound is produced when carbonic anhydrase acts on carbon dioxide and water?
- Hydrogencarbonate ion
- Carbaminohaemoglobin
- Carbonic acid
- Haemoglobinic acid
-
Where do chloride ions move during the chloride shift in respiring tissues?
- Into tissue fluid
- Into blood plasma
- Out of erythrocytes
- Into erythrocytes
-
How does a high carbon dioxide concentration affect haemoglobin's oxygen affinity?
- Increases affinity
- Prevents oxygen unloading
- Has no effect
- Decreases affinity
-
How does the oxygen affinity of fetal haemoglobin compare to adult haemoglobin?
- Higher affinity
- Identical affinity
- Lower affinity
- Zero affinity
-
What causes the sigmoidal shape of the haemoglobin oxygen dissociation curve?
- Competitive inhibition
- Active transport
- Cooperative binding
- Allosteric degradation
-
What happens to haemoglobin at low partial pressures of oxygen in respiring tissues?
- Denatures permanently
- Binds oxygen tightly
- Unloads oxygen
- Absorbs hydrogencarbonate
-
Which way does the oxygen dissociation curve shift during strenuous exercise?
- To the left
- To the right
- Upwards only
- Downwards only
-
What compound forms when haemoglobin binds with hydrogen ions to buffer blood pH?
- Carbaminohaemoglobin
- Oxyhaemoglobin
- Carbonic acid
- Haemoglobinic acid
-
Where is the oxygen dissociation curve for fetal haemoglobin located relative to adult haemoglobin?
- To the left
- To the right
- Directly below
- Directly above
-
A haemoglobin molecule has 3 of its 4 oxygen binding sites occupied. What is its percentage saturation?
- 25%
- 50%
- 100%
- 75%
-
Which ion moves into erythrocytes to compensate for hydrogencarbonate leaving during respiration?
- Potassium ion
- Chloride ion
- Sodium ion
- Calcium ion
-
What property of oxygen binding to haemoglobin allows loading in lungs and unloading in tissues?
- Ionic interaction
- Reversible binding
- Covalent bonding
- Irreversible binding
-
What is plotted on the x-axis of an oxygen dissociation curve?
- Oxygen partial pressure
- Carbon dioxide concentration
- Percentage saturation
- Blood pH
-
What compound does carbonic anhydrase directly produce from carbon dioxide and water?
- Hydrogencarbonate ions
- Carbaminohaemoglobin
- Carbonic acid
- Haemoglobinic acid
-
What ion binds to haemoglobin to form haemoglobinic acid?
- Potassium ions
- Hydrogen ions
- Sodium ions
- Hydrogencarbonate ions
-
In what form is most carbon dioxide transported in the blood?
- Carbaminohaemoglobin
- Carbonic acid
- Dissolved in plasma
- Hydrogencarbonate ions
-
How does fetal haemoglobin compare to adult haemoglobin regarding oxygen affinity?
- Lower affinity
- No affinity
- Higher affinity
- Equal affinity
-
How does high carbon dioxide concentration affect oxygen affinity in the Bohr effect?
- Has no effect
- Prevents dissociation
- Decreases affinity
- Increases affinity
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