Cell Cycle: Prophase Stage Explanation

What happens in the prophase stage of the cell cycle?

a. Ribosomal RNA synthesis stops

b. Chromosomes condense

c. Nucleolus disappears

d. Nuclear envelope fragments

Answer:

The correct options are a, c, and d.

The prophase stage of the cell cycle is a crucial phase where several significant events occur. Firstly, ribosomal RNA synthesis stops as chromosomes condense. This condensation leads to the disappearance of the nucleolus and fragmentation of the nuclear envelope. The membrane-bound organelles, such as the Golgi complex and endoplasmic reticulum, also fragment and relocate to the cell's periphery.

Additionally, microtubules start to form between centrosomes, which are moving towards opposite poles of the cell, contributing to the further lengthening of microtubules. As chromosomes become tightly coiled, they are visible under a light microscope. The correct options for the prophase stage of the cell cycle are a, c, and d.