Multiple Choice
How is hemoglobin's affinity for oxygen affected by the presence or absence of oxygen?
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17. The Blood
Erythrocytes: Hemoglobin
Multiple Choice
Which part of the protein hemoglobin binds and transports oxygen in the blood?
A
Phosphate group
B
Globin chain
C
Heme group
D
Iron-sulfur cluster
Verified step by step guidance1
Understand the structure of hemoglobin: Hemoglobin is a protein found in red blood cells, responsible for transporting oxygen from the lungs to the rest of the body.
Identify the components of hemoglobin: Hemoglobin is composed of four subunits, each containing a protein chain (globin) and a heme group.
Focus on the heme group: Each heme group contains an iron ion (Fe²⁺) at its center, which is crucial for oxygen binding.
Recognize the role of the iron ion: The iron ion in the heme group can reversibly bind to an oxygen molecule (O₂), allowing hemoglobin to transport oxygen.
Conclude that the heme group is responsible for oxygen binding: The heme group's iron ion is the specific part of hemoglobin that binds and transports oxygen in the blood.
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