All of the following statements are true EXCEPT
A) cytoplasmic localization occurs in all oocytes.
B) in a yolk-rich egg, most yolk is at one pole and the opposite pole has little yolk.
C) during cleavage, a furrow appears on the cell surface and defines the plane of the cut.
D) deuterostomes undergo bilateral cleavage.
E) cleavage results in descendant cells with different types and proportions of substances.

Question

All of the following statements are true EXCEPT  
A) cytoplasmic localization occurs in all oocytes.
B) in a yolk-rich egg, most yolk is at one pole and the opposite pole has little yolk.
C) during cleavage, a furrow appears on the cell surface and defines the plane of the cut.
D) deuterostomes undergo bilateral cleavage.
E) cleavage results in descendant cells with different types and proportions of substances.

Quizplus · Accepted Answer

Deuterostomes actually undergo radial cleavage, not bilateral cleavage. This is a key characteristic that distinguishes them from protostomes, which can exhibit spiral cleavage.

All of the Following Statements Are True EXCEPT