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Which five statements about hemoglobin and myoglobin structure are true? By itself, heme is not a good oxygen carrier. It must be part of a larger protein to prevent oxidation of the iron atorn. Each hemoglobin or myoglobin molecule can bind four oxygen molecules. Both hemoglobin and myoglobin contain a prosthetic group called heme, which contains a central iron atom. Hemoglobin is a heterotetramer, whereas myoglobin is a monomer. Heme is composed of an organic protoporphyrin component and a metal atom. Each iron atom can form six coordination bonds. Two of these bonds are formed between iron and oxygen. Molecular oxygen binds reversibly to Fe²+ in heme.

The average volume of a red blood cell is 87 um'. The mean concentration of hemoglobin in red blood cells is 0.34 g-ml-¹. What is the weight of the hemoglobin contained in an average red blood cell? hemoglobin weight: x10 How many hemoglobin molecules are there in an average red blood cell? Assume that the molecular weight of the human hemoglobin tetramer is 65 kDa. number of hemoglobin molecules: x10 molecules