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Red blood cells are the most common type of blood cell and delivering oxygen to the body tissues via the blood. There is no DNA in mature RBC. The reticulocyte which is the immediate precursor of the mature RBC evolves into mature RBC within 24 hours of release into the peripheral circulation.

1. Mature RBCs lack DNA.
2. Reticulocytes are precursors of mature RBCs.
3. RBCs deliver oxygen to body tissues.
4. All of the above.

Correct answer: All of the above.

Solution

Each statement is correct: mature RBCs do not contain DNA, reticulocytes are the immediate precursors of mature RBCs, and RBCs transport oxygen to tissues. Since all three are true, the option that includes all of them is correct.

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