QQuestionAnatomy and Physiology
QuestionAnatomy and Physiology
Choose the statement that is true concerning hemoglobin.
A. It is composed of four protein chains and four heme groups.
B. It can bind a maximum of three oxygen molecules.
C. It is found in the plasma portion of blood.
D. When hemoglobin is not bound to oxygen, it appears blue.
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Answer
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Step 1:Let's solve this step by step:
Step 2:: Understand Hemoglobin Structure
Hemoglobin is a complex protein found in red blood cells that plays a crucial role in oxygen transport. Let's analyze each statement carefully.
Step 3:: Examine Option A
\text{Hemoglobin Structure} = 4 \text{ protein chains} + 4 \text{ heme groups}
This statement is CORRECT. Hemoglobin consists of: - 4 protein chains (2 alpha and 2 beta chains) - 4 heme groups (one attached to each protein chain) - Each heme group can bind one oxygen molecule
Step 4:: Evaluate Option B
\text{Oxygen Binding Capacity} = 4 \text{ O}_2 \text{ molecules}
Hemoglobin can actually bind a MAXIMUM of 4 oxygen molecules, not 3: - 1 oxygen molecule per heme group - 4 heme groups per hemoglobin molecule
Step 5:: Analyze Option C
Hemoglobin is NOT found in plasma. It is located INSIDE red blood cells.
Step 6:: Investigate Option D
Deoxygenated hemoglobin appears dark red, NOT blue.
Final Answer
Hemoglobin is composed of four protein chains and four heme groups.
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