Question

Nuclear envelope appears at
A. Metaphase
B. Anaphase
C. Cytokinesis
D. Telophase

Answer 1

Hint: When the cell division is complete and the cell retains all its material at its particular place that is the time when the nuclear membrane appears back on the outer side of the cell.

Complete answer:
A cell cycle starts with the prophase during which the nuclear membrane, nuclei, Golgi bodies all disappear and DNA material present in the cells condenses into chromosomes called sister chromatids. This phase is followed by metaphase during which the sister chromatids align at an equatorial plane and they are attached with centromeres of spindle fibres which formed during the prophase. After the metaphase comes the anaphase during which the sister chromatids detach and are separated on opposite poles. In the telophase stage the chromatids present on the opposite pole unwind and form DNA strands, spindle fibres disappear and the nuclear envelope appears after which the cells are divided into two by cytokinesis.

Hence, the correct answer is option (D).

Additional information:
-The process of cell division is occurring in two types’ mitosis and meiosis. These both cell divisions are similar in all the organisms in which they occur.
-Mitosis increases the number of cells by making duplicate copies/clones of the parent cells, whereas meiosis leads to genetic manipulation in the cells and is a part of sexual reproduction.
-Without cell division there will be no growth and reproduction.
-Cells cannot divide forever they stop after 40-50 divisions but in case of cancerous cells they have the capacity to divide forever without losing their DNA.

Note: Meiosis occurs in the gamete formation which leads to formation of embryo which is a connecting link between generations. Some proteins in the cells prepare the cells for cell division with the help of which a single celled zygote develops into a multicellular embryo and then a whole organism.