Question

signment Score: 1775/1900 Resources C Give Up? Feedback Resume Question 5 of 19 > Attempt 6 Which five statements about hemoglobin and myoglobin structure are true? Both hemoglobin and myoglobin contain a prosthetic group called heme, which contains a central iron atom. Molecular oxygen binds reversibly to Fe²+ in heme, Each iron atom can form six coordination bonds. Two of these bonds are formed between iron and oxygen. Hemoglobin and myoglobin are heterotetramers. Each hemoglobin molecule can bind four oxygen molecules, cach myoglobin can bind only one oxygen molecule. By itself, heme is not a good oxygen carrier. It must be part of a larger protein to prevent oxidation of the iron atom. Heme is composed of an organic protoporphyrin component and a metal atom.

Answer 1

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FALSE STATEMENTS ARE:

• Hemoglobin and myoglobin are heterotetramers.

Corrected: Hemoglobin is a heterotetramer and myoglobin is NOT heterotetramer.

• Each iron atom can form six coordination bonds. Two of these bonds are formed between iron and oxygen.

Corrected: Each iron atom can form six coordination bonds. ONE of these bond are formed between iron and oxygen.

CORRECT STATEMENTS ARE:

• Both hemoglobin and myoglobin contain a prosthetic group called heme, which contains a central iron atom.
• Molecular oxygen binds reversibly to Fe²⁺ in heme.
• Each hemoglobin molecule can bind four oxygen molecules; each myoglobin can bind only one oxygen molecule.
• By itself, heme is not a good oxygen carrier. It must be part of a larger protein to prevent oxidation of the iron atom.

• Heme is composed of an organic protoporphyrin component and a metal atom.

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