Lesson 15A.5
15A.5 Biological complexes: haemoglobin Quiz: Pearson Edexcel Chemistry, Unit 15
20 questions
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Lesson 15A.5, Biological complexes: haemoglobin: 20 multiple choice questions for the Pearson Edexcel Chemistry (9CH0), Unit 15: Transition Metals, written with Revision Ninja.
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The 20 questions
-
Which metal ion is at the centre of the haem group in haemoglobin?
- Copper
- Magnesium
- Zinc
- Iron
-
What is the oxidation state of the iron in haemoglobin that binds oxygen?
- +1, as iron(I)
- +4, as iron(IV)
- +2, as iron(II)
- +3, as iron(III)
-
What type of bond forms between iron(II) and oxygen in oxyhaemoglobin?
- Non-polar covalent bond
- Hydrogen bond
- Dative covalent bond
- Ionic bond
-
What type of ligand is the porphyrin ring in the haem group?
- Monodentate ligand
- Multidentate ligand
- Bidentate ligand
- Unidentate ligand
-
What type of reaction occurs when oxygen replaces water in haemoglobin?
- Ligand substitution
- Redox reaction
- Precipitation
- Acid-base reaction
-
In haemoglobin, which ligand is replaced by carbon monoxide in the ligand exchange?
- Chloride, Cl-
- Oxygen, O2
- Ammonia, NH3
- Water, H2O
-
What oxidation state is the iron ion in functional haemoglobin?
- +2
- 0
- +3
- +1
-
Which molecule is the ligand in oxyhaemoglobin?
- CO2
- H2O
- N2
- O2
-
What is the approximate number of haem groups in one haemoglobin molecule?
- Four
- Two
- Eight
- One
-
How is oxygen transport affected if Fe(II) in haemoglobin is oxidised to Fe(III)?
- It is unaffected
- It is impaired
- It is enhanced
- It is doubled
-
Which ligand in oxyhaemoglobin is replaced during carbon monoxide poisoning?
- Water
- Carbon dioxide
- Oxygen
- Nitrate
-
Roughly how many times more strongly does CO bind to haemoglobin than O2?
- About 200 times
- About 2 times
- About 20 times
- About 2000 times
-
Why can haemoglobin transport oxygen effectively throughout the human body?
- Precipitation reactions
- Reversible binding
- Variable oxidation states
- Irreversible binding
-
What is the name of the product formed when CO binds to haemoglobin?
- Methaemoglobin
- Carboxyhaemoglobin
- Oxyhaemoglobin
- Ferrihaemoglobin
-
Why can blood plasma alone not meet the body's demand for oxygen?
- High O2 density
- Rapid O2 breakdown
- Low O2 solubility
- High O2 reactivity
-
What metal ion is present at the centre of a haem group?
- Copper(II)
- Zinc(II)
- Iron(II)
- Magnesium(II)
-
Which gas binds to haemoglobin much more strongly than oxygen?
- Carbon dioxide
- Hydrogen
- Nitrogen
- Carbon monoxide
-
Which metal ion is at the centre of the haem complex in haemoglobin?
- Fe3+
- Mg2+
- Fe2+
- Cu2+
-
What is the d-electron count of the Fe(II) centre in haem?
- 8
- 4
- 5
- 6
-
What is the oxidation state of iron in methaemoglobin, the form in which iron is oxidised?
- +3
- +4
- +2
- +1
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