Haeomoglobin Flashcards
1
Q
structure of haemoglobin ?
A
- quarternary structure
- 2x alpha subunits
- 2x beta subunits
- 4x haem groups
- each haem group has a iron ion
2
Q
what does the iron ion have ?
A
an affinity to oxygen
3
Q
what is meant by ‘ affinity’ ?
A
the tendency to stick together
4
Q
haemoglobin + oxygen = ?
A
oxyhaemoglobin
5
Q
what saturation can haemoglobin have ?
A
25%
50%
75%
100%
6
Q
what kind of binding does haemoglobin show ?
A
cooperative binding
7
Q
what is meant by cooperative binding ?
A
it means that when oxygen binds to a haem group the 3D shape of the subunit changes where the binding pocket pushes the haem group downwards making it easier for oxygen to bind to the next haem group
