NEET BIOLOGY

CELL STRUCTURES AND FUNCTION

CELL CYCLE

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Which phase of mitosis does the nucleus come back to surround two different sets of DNA that have begun to uncoil?

A	Prophase
B	Metaphase
C	Anaphase
D	Telophase

Explanation:

Detailed explanation-1: -Metaphase is followed by anaphase where the chromosomes separate. Finally, during telophase nuclear membranes reappear around the two sets of chromosomes. Mitosis is now complete. After mitosis two new cells are formed by a process called cytokinesis.

Detailed explanation-2: -During telophase, a nuclear membrane forms around each set of chromosomes to separate the nuclear DNA from the cytoplasm. The chromosomes begin to uncoil, which makes them diffuse and less compact.

Detailed explanation-3: -Interphase. During this phase, the DNA is uncoiled and called chromatin.

Detailed explanation-4: -During telophase, the newly separated chromosomes reach the mitotic spindle and a nuclear membrane forms around each set of chromosomes, thus creating two separate nuclei inside the same cell.

Detailed explanation-5: -Re-formation of the Interphase Nucleus During the completion of mitosis (telophase), two new nuclei form around the separated sets of daughter chromosomes (see Figure 8.29).

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