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Question

The reason behind why mature human RBCs cannot divide or metabolise is
  1. because they carry oxygen
  2. because they are present in blood stream
  3. because they lack nucleus
  4. because they are biconcave in shape


Solution

The correct option is C because they lack nucleus
Red blood cells (RBCs) or erythrocytes are cells which are responsible for the transportation of oxygen and carbon dioxide. RBCs have a characteristic biconcave shape. Erythropoiesis is the process of maturation of RBCs. One of the steps in erythropoiesis includes extrusion of nucleus from RBCs. Thus, a mature human RBC lacks a nucleus. 
Nucleus is known as the ‘brain’ of a cell. It regulates all the activities that takes place in a cell. Absence of nucleus means no cell division. Such a cell lacks any kind of metabolism. Thus, absence of nucleus is the correct reason behind why RBCs cannot divide or metabolise.
 

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