Author Question: Which of the following has a pyknotic nucleus? a. Pronormoblast b. Basophilic normoblast c. ... (Read 62 times)

CQXA · **on:** Jun 25, 2018

Which of the following has a pyknotic nucleus?

a. Pronormoblast
b. Basophilic normoblast
c. Polychromatophilic normoblast
d. Orthochromic normoblast

Question 2

Which of the following is true of red cell precursors as they mature?

a. The nuclear-to-cytoplasmic ratio increases.
b. The cells become larger.
c. The cytoplasm becomes less basophilic.
d. The nucleoli become more prominent.

stillxalice · **Reply #1 on:** Jun 25, 2018

Answer to Question 1

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.

Answer to Question 2

ANS: C
In general, basophilia decrease as the red cell matures (one exception to this: the basophilic normoblast is characteristically more basophilic than its precursor, the pronormoblast). The nuclear-to-cytoplasmic ratio actually decreases, the cells become smaller, and nucleoli become less prominent and eventually disappear.