Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Erythrocytes are biconcave discs with prominent nuclei.
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17. The Blood
Introduction To Blood
Problem 4d
Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Hemoglobin consists of two polypeptide chains bound to a heme group.
Verified step by step guidance1
Step 1: Understand the structure of hemoglobin. Hemoglobin is a protein found in red blood cells responsible for oxygen transport. It consists of four polypeptide chains (not two), specifically two alpha chains and two beta chains, each bound to a heme group.
Step 2: Analyze the statement provided. The statement claims that hemoglobin consists of two polypeptide chains bound to a heme group. Compare this claim to the correct structure of hemoglobin.
Step 3: Identify the error in the statement. The statement is false because hemoglobin consists of four polypeptide chains, not two.
Step 4: Correct the false statement. The corrected statement should read: 'Hemoglobin consists of four polypeptide chains, each bound to a heme group.'
Step 5: Review the corrected statement and ensure it aligns with the accurate description of hemoglobin's structure.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Hemoglobin Structure
Hemoglobin is a protein in red blood cells responsible for transporting oxygen. It consists of four polypeptide chains—two alpha and two beta chains—each bound to a heme group, which contains iron. This structure allows hemoglobin to effectively bind and release oxygen in the body.
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Polypeptide Chains
Polypeptide chains are long sequences of amino acids linked by peptide bonds, forming the primary structure of proteins. In hemoglobin, the specific arrangement and interaction of these chains are crucial for its function in oxygen transport and release.
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Heme Group
The heme group is a complex molecule that contains an iron atom at its center, which is essential for oxygen binding. Each heme group can bind one oxygen molecule, and the presence of four heme groups in hemoglobin allows it to carry up to four oxygen molecules at a time, facilitating efficient oxygen transport in the bloodstream.
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