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which is the phase in which the nuclear envelope is fully intact? A.metaphase B.prophase C.prometaphase D.anaphase

which is the phase in which the nuclear envelope is fully intact?

A.metaphase

B.prophase

C.prometaphase

D.anaphase

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Answer #1

The Correct answer is option 'B' i.e. prophase. Nuclear envelope is the membrane which separates the nucleus from cytoplasm. Mitosis has four phases: prophase, metaphase, anaphase and telophase. Prophase is the first and largest phase of cell division (mitosis/meiosis). In the given options only prophase has the intact nuclear envelope which lasts for the late prophase. But prophase ends with the disappearance of nucleolus and breakdown of nuclear envelope. Nuclear envelope breaks into membrane vesicles which are similar to those of ER. In metaphase and anaphase of open Mitosis nuclear envelope remains break but in telophase nuclear envelope reforms around each group of chromosomes. So, in the given options prophase is the correct answer.

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