Haemoglobin and the Transport of Oxygen and Carbon Dioxide (OCR A-Level Biology A): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
How many polypeptide chains make up a haemoglobin molecule?
How many polypeptide chains make up a haemoglobin molecule?
4 chains (2 alpha, 2 beta)
How many oxygen molecules can one haemoglobin molecule bind in total?
How many oxygen molecules can one haemoglobin molecule bind in total?
4 oxygen molecules
What happens when the first oxygen molecule binds to haemoglobin?
What happens when the first oxygen molecule binds to haemoglobin?
It causes conformational change
Why is the oxygen dissociation curve S-shaped (sigmoidal)?
Why is the oxygen dissociation curve S-shaped (sigmoidal)?
Due to cooperative binding
What is the partial pressure of oxygen in the lungs and the saturation level achieved?
What is the partial pressure of oxygen in the lungs and the saturation level achieved?
~13 kPa, ~97% saturation
What effect does increased CO₂ concentration have on the oxygen dissociation curve?
What effect does increased CO₂ concentration have on the oxygen dissociation curve?
Shifts curve to the right
What chains does fetal haemoglobin contain instead of beta chains?
What chains does fetal haemoglobin contain instead of beta chains?
Gamma chains
What percentage of CO₂ is transported as hydrogen carbonate (HCO₃⁻) ions?
What percentage of CO₂ is transported as hydrogen carbonate (HCO₃⁻) ions?
70-90%
Where is the enzyme carbonic anhydrase found?
Where is the enzyme carbonic anhydrase found?
Only in red blood cells
During the chloride shift, what ion enters the red blood cell?
During the chloride shift, what ion enters the red blood cell?
Chloride ions (Cl⁻)