O2-binding curves10.90.820.730.60.50.40.30.20.110012020406080po2 (torr)Fractional Saturation 4. Is curve #3 shifted more towards R- or T- state,relative to curve #2?The binding curve for oxygen ischoose your answer...Vfor hemoglobin andfor myoglobinchoose your answer...V

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Asked Oct 13, 2019
O2-binding curves
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po2 (torr)
Fractional Saturation
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O2-binding curves 1 0.9 0.8 2 0.7 3 0.6 0.5 0.4 0.3 0.2 0.1 100 120 20 40 60 80 po2 (torr) Fractional Saturation

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4. Is curve #3 shifted more towards R- or T- state,
relative to curve #2?
The binding curve for oxygen is
choose your answer...
V
for hemoglobin and
for myoglobin
choose your answer...
V
help_outline

Image Transcriptionclose

4. Is curve #3 shifted more towards R- or T- state, relative to curve #2? The binding curve for oxygen is choose your answer... V for hemoglobin and for myoglobin choose your answer... V

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Expert Answer

Step 1

The oxygen-hemoglobin dissociation curve describes the transport of oxygen by the blood. The curve plots the relation between saturated hemoglobin on the y-axis and partial pressure of oxygen (P02) on the x-axis. The plot explains the affinity of oxygen for the hemoglobin in different tissues of the body. Single hemoglobin molecule binds to 4 molecules of oxygen in the reversible method.

Step 2

The efficiency with which oxygen binds to hemoglobin depends upon several factors such as, C02 concentration, acidity, temperature, and 2,3-BPG. All these factors shift the curve towards the right or to towards the left. The factors that shift the oxygen dissociation curve to the right are the biological states where tissues need additional oxygen like during exercise.

A rightward shift in the graph indicates that the hemoglobin molecules have decreased their affinity for oxygen molecules. Thus, oxygen cannot bind easily to the hemoglobin but oxygen dissociation from hemoglobin is facilitated.

Step 3

Hemoglobin is a globular protein having a quaternary structure. The hemoglobin molecule exists in two conformations: R-state (relaxed state) and T-state (tensed state). The T state of hemoglobin has less affinity for oxygen molecules. In T-state, oxygen is not bound to hemoglobin, such hemoglobin molecule is known as deoxyhemoglobin. On the other hand, R-form is the fully o...

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