Written by Prerak Juthani
Which of the following are true, with regards to Myoglobin and Hemoglobin?
a. both have 8 alpha helices and no beta sheets
b. both don’t have a quaternary structure
c. both display cooperativity
d. both have the same affinity for oxygen
e. both have only one heme group
a. both have 8 alpha helices and no beta sheets
b. both don’t have a quaternary structure
c. both display cooperativity
d. both have the same affinity for oxygen
e. both have only one heme group
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The correct answer is a. Both proteins have at least 8 alpha helices, and have no beta-sheets. Hemoglobin has a quaternary level, as it has four polypeptide units, each of which is capable of binding one heme group. Only hemoglobin displays cooperativity. Myoglobin has a higher affinity for oxygen than hemoglobin.