Which statement is true about red blood cells according to the material?

• A. They contain a nucleus
• B. They are the only anuclear cells
• C. They have 80S ribosomes
• D. They produce rRNA in the nucleolus

Answer: (B)

Red blood cells are produced in the bone marrow and mature by losing their nucleus, a process called enucleation. This leaves them as highly specialized, anuclear cells whose main function is to carry hemoglobin. Because mature erythrocytes lack a nucleus, they also lack most organelles, including ribosomes and a nucleolus, so they cannot synthesize proteins or RNA once mature.

That’s why the statement about being anuclear is true: mature red blood cells are the true anuclear cells among circulating formed elements. In contrast, they do not have a nucleus (false), they do not contain 80S ribosomes (false because they lack ribosomes), and they do not produce rRNA in a nucleolus (false because there’s no nucleolus).