Flashcards
HAEMOGLOBIN BIOL2
Cards in this deck (14)
- 1Haemoglobin molecules are make up of four coiled and folded polypeptide chains. What is each polypeptide chain associated with?A ferrous group - Fe2+
- 2How many oxygen molecules can each Fe2+ ion combine with?1
(1 haemoglobin molecule = 4 molecules of oxygen) - 3What is the role of haemoglobin?Transporting oxygen
- 4What two factors are required for haemoglobin to be efficient at transporting oxygen?- Readily associate with oxygen at the gas exchange surface
- Readily dissociate from oxygen at the tissues requiring it - 5These two factors contradict each other. What property of haemoglobin makes it possible?Haemoglobin changes its affinity for oxygen under different conditions - its shape changes which makes it bind more loosely or strongly to oxygen
- 6Out of the gas exhange surface and the respiring tissues, where is the oxygen concentration high?Gas exchange surface
- 7What does this mean about the concentration of carbon dioxide at the gas exchange surface?It is low
- 8How does this low concentration of carbon dioxide affect the affinity of haemoglobin for oxygen?Haemoglobin has a high affinity for oxygen
- 9What does this result in?Oxygen is attached readily
- 10At the respiring tissues, what is there a high concentration of and what is there a low concentration of?High concentration of carbon dioxide
Low concentration of oxygen - 11How does this high concentration of carbon dioxide affect the haemoglobins affinity for oxygen and what does this result in?The haemoglobin molecules have a low affinity for oxygen - oxygen is released from the haemoglobin molecules
- 12What type of haemoglobin does an organism living in an environment with little oxygen require?One that readily combines with oxygen ie a high affinity
- 13Why will it not matter that this haemoglobin does not readily dissociate with oxygen at the respiring tissues?The organisms metabolic rate may not be high
- 14Why do different haemoglobins have different affinities for oxygen?The shape of the molecule - slightly different sequences of amino acids - different affinities depending on the shape
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- A-Level AS AQA BIOLOGY Flashcards on HAEMOGLOBIN BIOL2, created by ashiana121 on 25/05/2015.
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