Question

What causes lamins to disassemble, and what stage does this occur?

a) DNA synthesis; S phase
b) Mitosis; M phase
c) Cell growth; G1 phase
d) Cell differentiation; G0 phase

Answer 1

Lamin disassembly occurs during the mitosis (M phase) to facilitate the breakdown of the nuclear envelope, allowing chromosome segregation. The correct answer is b) Mitosis; M phase.

Step-by-step explanation:

Lamins disassemble during the M phase of the cell cycle, specifically in mitosis. This event occurs to allow the chromosomes to be properly segregated into the daughter cells. The disassembly of the lamins, which are part of the nuclear lamina, facilitates the breakdown of the nuclear envelope that is necessary for mitosis to proceed.

Given the choices provided:

• DNA synthesis occurs during the S phase.
• Cell growth primarily takes place during the G1 phase.
• Cell differentiation often occurs in the G0 phase, which is a resting stage outside of the active cell cycle.

The correct answer to the question is b) Mitosis; M phase.