A Typical Hill Plot (Log [Y_O2/(1- Y_O2)] Vs Log P_O2)for

question 24

Multiple Choice

A typical Hill plot (log [Y_O2/(1- Y_O2) ] vs log P_O2) for hemoglobin-oxygen binding does not yield a straight line as it does for myoglobin. Which of the following is the best explanation for this?

• A)at high oxygen pressures, hemoglobin is in a low oxygen affinity state
• B)at low oxygen pressures, hemoglobin is in a high oxygen affinity state
• C)hemoglobin undergoes a transition from low affinity state under low oxygen pressure to a high affinity state under high oxygen pressure
• D)hemoglobin undergoes a transition from high affinity state under low oxygen pressure to a low affinity state under high oxygen pressure
• E)none of the above

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