Multiple choice Which of the following is not a property of erythrocytes? In most mamals, they are devoid of nucleus. They have a red-coloured iron containing protein. They have an average life-span of 120 days. They are biconcave in shape. They are produced from megakaryocytes. Reveal answer Fill a bubble to check yourself E Correct answer Explanation This is the correct option as this is not a property of erythrocytes. In adults, erythrocytes are produced in the red bone marrow.