Which of the following has a pyknotic nucleus?
a. Pronormoblast
b. Basophilic normoblast
c. Polychromatophilic normoblast
d. Orthochromic normoblast
ANS: D
The orthochromic normoblast has a pyknotic nucleus, meaning that the chromatin is fully condensed. After this stage, the cell no longer needs the nucleus and it is extruded or expelled. The nucleus of the pronormoblast is diffuse (dispersed); that of the basophilic is beginning to show some condensing; and that of the polychromatophilic condensing even more.
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