Nucleus – Structure And Function Practice Test

What is a notable property of the nuclear envelope during cell division?

It remains intact It doubles in thickness It breaks down during nuclear division It becomes part of the plasma membrane

Correct Answer:

It breaks down during nuclear division

Explanation:

During cell division the nuclear envelope must open up so spindle fibers can reach and attach to the chromosomes. The envelope breaks down in early mitosis when lamins are phosphorylated, causing the nuclear lamina to disassemble and the nuclear pores to disassemble as well. This breakdown creates space for microtubules to interact with chromosomes and ensures they can be properly aligned and separated. After the chromosomes are divided, the envelope re-forms around each set of chromosomes in telophase, restoring the double-membrane boundary and nuclear pores. So, it breaks down during nuclear division rather than staying intact, thickening, or becoming part of the plasma membrane.

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