The Variety of Life

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Flashcards for AS BIOL2 The Variety of Life
zenirah09
Flashcards by zenirah09, updated more than 1 year ago
zenirah09
Created by zenirah09 over 8 years ago
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Question Answer
What are haemoglobin molecules ? The haemoglobins are a group of chemically similar molecules found in a wide variety of organisms,
What is the structure of haemoglobin Primary structure - 4 polypeptide chains Secondary structure - polypeptide chains coiled into a helix Tertiary structure - each polypeptide chain is folded into a precise shape Quaternary structure - all polypeptides are linked together to form a spherical molecule
What type of ion is contained in haem group Each polypeptide is associated with a haem group which contains a ferrous ion. Each ferrous ion can combine with a single oxygen molecule making a total of four oxygen molecules hat can be carried by a single haemoglobin molecule in humans.
What is the role of haemoglobin and what two things must haemoglobin do to be efficient in carrying out its role The role of haemoglobin is to transport oxygen. to be efficient at transporting oxygen, haemoglobin must : readily associate with oxygen at the surface where gas exchange takes place Readily dissociate from oxygen at those tissues requiring it.
What happens in the presence of carbon dioxide. In the presence of carbon dioxide
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