In prophase,ribosomal RNA synthesis stops when the chromosomes condense,and this makes the
A)chromosomes lengthen.
B)nuclear envelope reform.
C)nucleolus disappear.
D)chromosomes line up at the equator.

Question

Quizplus · Accepted Answer

Prophase is the first stage of mitosis, in which the chromatin condenses into visible chromosomes. As the chromosomes condense, the nucleolus disappears, and ribosomal RNA synthesis stops. This is because the nucleolus is responsible for producing ribosomal RNA. Therefore, the correct choice is C, nucleolus disappears. Choices A, B, and D are incorrect because chromosomes do not lengthen, the nuclear envelope breaks down instead of reforming, and chromosomes do not line up at the equator until the prometaphase stage of mitosis.

In Prophase,ribosomal RNA Synthesis Stops When the Chromosomes Condense,and This