Mature mammalian RBC does not containA. Membrane bound cell organellesB. Carbonic anhydraseC. HaemoglobinD. Enzymes of the glycolytic pathway

The correct answer is A. Membrane bound cell organelles.

Mature mammalian red blood cells (RBCs), also known as erythrocytes, do not contain membrane-bound cell organelles. During their maturation process, RBCs lose their nucleus and most other organelles, such as mitochondria, endoplasmic reticulum, and Golgi apparatus. This loss of organelles allows RBCs to have more space to carry hemoglobin, the protein responsible for transporting oxygen.

Let's briefly look at why the other options are not correct:

B. Carbonic anhydrase: This enzyme is indeed present in mature RBCs and plays a role in carbon dioxide transport.
C. Haemoglobin: Hemoglobin is the main protein in RBCs, responsible for carrying oxygen.
D. Enzymes of the glycolytic pathway: RBCs rely mainly on glycolysis for their energy production, so enzymes of the glycolytic pathway are present in them.
Therefore, the absence of membrane-bound cell organelles is a distinctive feature of mature mammalian RBCs.